Fish are one of my favourite costume families to build, because almost every one comes down to the same handful of parts: a base garment in the right colour, scales, fins, a tail and one signature detail. Get that detail right (the clownfish stripes, the anglerfish lure, the hammerhead's wide head) and people name the fish before you've said a word. Below are thirty women's fish costumes, from sequinned goldfish to sardine tins and gummy candy, and most of them start from a dress, leggings or a hoodie you already have. I've noted where felt, foam and organza behave well, and where a fin or frame will cause trouble at a crowded party or on a cold walk outside.
Scales, Fins and Tails From Felt, Foam and Organza
Nearly every costume below is built from the same three parts, so it helps to know how the materials behave before you start cutting.
Scales
I cut scales from felt because it doesn't fray and holds a curve. Stitch them on in overlapping rows starting at the hem and working up, like roof tiles, so each row hides the stitches of the one below. Fabric glue is fine on cotton sweatshirts, but felt letters and scales peel off polyester and stretch knits once you start moving, so on a sports jersey or a sequin dress I hand tack each scale at the top edge. A rotary cutter and a cardboard template will save your hand if you need more than a hundred.
Fins
Soft fins look best in organza or chiffon, which catch the light and move when you walk. If a fin needs to stand up, I sandwich thin craft foam between two layers of fabric or sew a channel for plastic boning. EVA foam is stiffer and can be shaped with a hair dryer or heat gun, but it's heavier, so I save it for headpieces.
Tails
Never pin a tail straight to the dress. Attach it to a separate belt or waistband with hook-and-loop tabs, so it takes the weight, can be turned to the side when you sit, and comes off for the car ride. Hot glue tends to let go in cold air, so for an outdoor night I sew or use a strong fabric adhesive on anything that bears weight.
1. Goldfish Costume With Orange Sequin Dress
The goldfish is the one I'd suggest to anyone who has never made a costume, because an orange sequin dress does half the work. If you don't have one, an orange top over a layered tulle skirt and orange leggings gets you there. Overlap gold and orange felt scales across the bodice, add organza fins at the shoulders and hang a light fan-shaped tail at the back. Sequin dresses don't take glue well, so I tack the felt on with a few hand stitches instead. A high ponytail with orange extensions or a short copper wig, gold shadow and a coral lip finish the face, and a clear bubble purse or small cardboard fishbowl gives your hands something to do. Orange tights with gold sneakers or flats keep you comfortable all night.
2. Clownfish Costume With Striped Orange Outfit
Clownfish stripes have one rule people forget: each white band needs a thin black edge, or it just reads as an orange and white outfit. I cut wide white felt bands, stitch narrow black felt along both edges, then wrap them around the torso, sleeves and legs of an orange jumpsuit, or a sweatshirt and leggings. Soft foam fins can sit along the arms, and a rounded tail attaches to the back with hook-and-loop tabs so it comes off when you sit. An orange bob wig or orange ribbons woven through your own hair, white and black liner and a little orange on the cheeks carry the stripe idea up to the face. Black flats or orange sneakers keep it practical for a family night out.
3. Betta Fish Costume With Flowing Blue Fins
A betta lives or dies on how its fins move, so fabric choice matters more than anything else here. Chiffon in blue, purple and turquoise ripples every time you turn; heavier satin just hangs. Start with a fitted royal-blue dress or bodysuit over opaque blue leggings, then attach long chiffon panels at the shoulders, hips and back. I hem them a good few inches above the floor, because a trailing panel gets stepped on within the first hour. A wavy updo with iridescent clips or a blue-to-purple ombré wig suits it, with cobalt, violet and silver shadow and a berry lip. Keep the shoes plain (blue flats or low boots) so nothing competes with the fins.
4. Koi Fish Costume With Red And White Dress
Koi markings look wrong the moment they're symmetrical. When I place the red, orange and black scale patches on a white wrap dress or long tunic, I scatter them unevenly on purpose, heavier on one shoulder and lighter on the other, the way real koi are patched. Sheer white sleeves, a small dorsal fin and an orange-and-white tail secured at the waist give the shape. A black bob wig is striking, though a neat bun with red pins does the job. Pearly makeup with soft coral shadow and a few tiny red scales at the temples ties the face in, and a blue paper fan makes an easy prop. White tights and red flats are the clean option; swap in a longer dress and sneakers if you want more coverage for a long evening.
5. Angelfish Costume With Black And Silver Outfit
Angelfish are all about height, and that tall dorsal fin is where I see builds fail. Pinning a stiff fin straight onto a dress drags the fabric down and pulls the neckline sideways. I mount it on a simple fabric harness worn under or over a black midi dress or jumpsuit, so the weight sits on the shoulders. Vertical strips of silver and pale yellow fabric give the stripes, and triangular side fins cut from thin foam covered in organza attach near the arms or waist. A high ponytail with silver extensions or a smooth black wig with glitter clips, silver shadow, sharp black liner and a few pearls suit the sleek look. Black tights with silver flats, low block heels or metallic sneakers let you move easily.
6. Blue Tang Costume With Royal Blue Jumpsuit
The blue tang reads from its colour first, so I'd spend the effort on getting a true royal blue base rather than a navy or teal one. A blue jumpsuit, sweatshirt dress, or top and leggings all work. The black markings go along the sides and back in felt, and the bright yellow tail fin attaches to a belt. Keep the forearm fins small and stitched above the wrist; anything that hangs over your hands gets dipped in drinks and caught on bags. A cobalt wig with a yellow clip or a ponytail wrapped in blue ribbon, blue shadow with crisp black liner and a dot of yellow at the inner corners finish the face. A clear purse stuffed with blue tissue bubbles and yellow sneakers or flats round it off.
7. Pufferfish Costume With Beige Tulle Skirt
What could be more fun than a pufferfish that looks like it just inflated? The volume comes from a full tulle skirt layered under a beige or pale yellow sweatshirt and leggings. For the spikes I roll felt into small cones or fold craft foam into soft points and stitch them across the sweatshirt and skirt. Rigid points are a mistake here, because in a crowded room people brush against you all night. A short sandy-blonde wig or two round buns, golden shadow, rosy cheeks and a few dotted details at the temples keep the face cheerful. A round bubble purse or a sign reading “Feeling Puffed Up” lands the joke, and cushioned beige sneakers keep the whole thing easy to wear.
8. Lionfish Costume With Red And White Fins
Lionfish fins are fan-shaped and striped, which means they need something inside them to hold the fan open. I sew narrow channels into pleated organza and slide in flexible boning or thin foam strips; without that support the fins collapse into limp scarves after an hour. The base is a rust-red dress, tunic or jumpsuit over cream leggings, with narrow white and burgundy stripes across it and the fins attached at the arms and hips. A red-and-white streaked wig captures the feathery spines, or tease your own hair and add striped ribbons. Copper shadow, white graphic liner and a burgundy lip suit it. Cream tights and red ankle boots or sneakers finish it, and keep every fin tip rounded so nobody gets poked.
9. Anglerfish Costume With Glowing Headpiece
The lure is the whole costume, and it's the part I test longest. I bend a curved pipe cleaner (or a length of thin wire) up from a flexible headband, cover it in fabric and fix a small battery light at the tip. Check it in a mirror with your head turned: it should sit above your eyeline and not bounce into your face when you walk. Under it, a black hooded dress, oversized sweatshirt or jumpsuit with opaque leggings, plus dark gray felt scales and soft fins along the sleeves and back. Tuck your hair under the hood or wear a short black wig with faint blue streaks. Navy shadow, silver highlight and dotted glowing accents keep it deep-sea rather than frightening, which matters at public events. Black sneakers or flat boots are all you need on your feet.
10. Great White Shark Costume With Gray Hoodie
If you'll be outdoors in the cold, the great white is the one I'd pick, because it's built on a gray zip-up hoodie and joggers. A white top underneath shows at the front, and a white felt belly stitched to the hoodie extends it. Add a soft dorsal fin down the back, smaller fins on the sleeves and a curved gray tail on a fabric loop at the waistband. The teeth are white felt triangles sewn around the hood opening, with big cartoon eyes on top; glue tends to pop off a hood that gets pulled up and down all night, so I stitch them. A low braid sits comfortably under the hood. Cool gray shadow and a pearly highlight are plenty, and a light surfboard sign plus gray sneakers make it easy to walk in for hours.
11. Hammerhead Shark Costume With Foam Headpiece
The hammerhead's wide headpiece is what makes people laugh, and it's also what catches in every doorway. I build it from lightweight foam with soft round eyes at both ends, mount it on a padded headband, and walk through a few doors at home before wearing it anywhere crowded. A low bun or braid keeps it sitting level. Under it, a charcoal jumpsuit, hoodie dress, or gray sweater and fitted pants carries a pale belly panel, side fins, a dorsal fin and a gently curved tail. Smoky gray eyes with silver highlights suit the sleek outfit, and an ocean-blue tote or small plush fish is enough of a prop. Gray slip-ons or flat boots finish it, and none of it needs complicated sewing.
12. Seahorse Costume With Yellow Ruffled Dress
A seahorse is defined by its curled tail, and the curl is hard to keep. Stuffed fabric droops unless it has something stiff inside, so I run a bendable wire or a strip of foam through the stuffing and anchor the tail to a waist belt rather than the dress itself. Ruffles suit the shape, so start with a mustard-yellow or coral ruffled dress over matching leggings, add a pale belly panel down the front and a row of soft felt ridges along the back. A small crown-shaped fin on a padded headband and a curled ponytail or wavy yellow-orange wig frame the face, with golden shadow, fine dotted freckles and a coral lip. Oversized faux pearls or a tiny sea-grass bouquet, then gold flats or yellow sneakers so you can walk easily.
13. Sardine Tin Costume With Silver Cardboard Frame
The sardine tin is the most fun on this list to make, and the one where I'd think hardest about sitting down. Wear a silver hoodie, metallic top or gray dress with matching leggings, and add foil-coloured fabric scales, a narrow tail and cartoon eyes on the hood. For the tin, cut two rounded rectangles of cardboard, paint them silver and join them with padded shoulder straps so the tin hangs open around you. Leave generous room at the head, arms and legs, and make it narrow enough to get through doors. A silver cardboard pull tab is the finishing touch. Keep your hair sleek or under the hood, add silver shadow and a glossy nude lip, then metallic sneakers. Build it so it lifts off in one move whenever you need a chair.
14. Tuna Fish Costume With Silver Blue Dress
A tuna is a good choice for an office party because the shape is sleek and the colours stay grown-up. A silver-blue midi dress, fitted tunic or metallic sweatshirt over navy leggings is the base, with darker blue fabric across the back and a pale silver belly panel at the front. The small finlets running from the waist toward the crescent tail are the detail that says tuna rather than generic fish, so I don't skip them; soft felt triangles stitched in a row are enough. A smooth high ponytail with navy ribbon or a shoulder-length steel-blue wig, blue-gray shadow with a sharp silver liner and a cool pink lip suit it. A compact blue bag or light cardboard wave, navy tights and silver sneakers or loafers finish it.
15. Salmon Costume With Pink Metallic Outfit
Salmon is easy to get wrong if the pink goes too bright; it starts looking like a flamingo. I stick to coral and peach with silver mixed in. A coral-pink jumpsuit, sweater dress, or top and leggings carries layered rose, peach and silver felt scales across the torso, gray fins and a broad forked tail at the back. One darker stripe down each side defines the fish shape more than extra scales would. A rose-gold bob wig or pink extensions in a low ponytail, peach shadow, silver liner and a fresh pink lip keep the makeup light. A blue river sign, a small bubble purse or a paper stream on a short handle hints at swimming upstream, and silver sneakers or pale pink ankle boots finish it.
16. Rainbow Trout Costume With Spotted Dress
The rainbow trout is one of the more realistic options here, so the base colour should be muted: olive, taupe or silver-gray. On that, a rosy stripe down each side and a scatter of small black and red felt dots across the sleeves, bodice and skirt give the speckled look. I cut the dots with a hole punch from stiff felt, which saves hours compared with scissors. Translucent gray fins and a broad tail edged in a darker shade finish the fish. Loose waves with a pink-and-green braided headband or a soft silver wig, rosy highlighter, a few dotted accents and muted green shadow suit it. A blue ribbon streamer is an easy river prop, and gray tights with olive sneakers or waterproof boots make sense if you're outdoors in cool weather.
17. Catfish Costume With Gray Whiskers
The catfish is a pun costume, so the whiskers have to be obvious. I make them from flexible fabric tubes or felt strips attached to the hood or a headband, angled out and down, well away from your eyes; anything that brushes your face gets pulled off by the end of the night. A gray hoodie dress, jumpsuit or oversized sweatshirt with leggings, a cream belly panel, small side fins and a broad rounded tail make the fish, and soft gray cat ears above the eyes push the joke further. Tuck your hair into the hood or wear low pigtails. Charcoal whisker dots, silver shadow and a soft pink lip are all the makeup it needs. A yarn-ball purse with paper bubbles and gray sneakers or slip-ons finish this cosy one.
18. Flying Fish Costume With Blue Cape Fins
Flying fish fins work like a cape that opens when you lift your arms, and the length is everything. I attach two broad panels of lightweight pleated fabric from the wrist to the side of the waist, and keep them short enough that they clear the floor even when your arms hang down. Lighter fabric moves more, so I'd choose chiffon over anything stiff. Start with a turquoise jumpsuit, blue skater dress, or top and leggings, then add a silver belly, a small dorsal fin and a forked blue tail. A windswept high ponytail with teal and silver ribbons, aqua shadow, bright silver liner and pearly cheeks keep the look airy. Carry a soft cloud prop or blue bubble bag, and wear silver sneakers or turquoise flats.
19. Flounder Costume With Brown Spotted Outfit
A flounder is a funny alternative to the bright tropical fish, and the joke is that both eyes sit on one side. I place two soft cartoon eyes close together on one side of the hood or headband and wear the hair in a side ponytail to push the lopsided look. A tan sweatshirt dress, poncho or roomy tunic over brown leggings carries irregular brown and cream spots on one side and a flattened oval fish panel that follows the body without pinning your arms. A small rounded tail and subtle side fins finish the shape. Bronze shadow with a few dotted details on one cheek suits it, plus a sandy shell purse or blue fabric wave. Brown sneakers or flat ankle boots work for an outdoor party.
20. Ocean Sunfish Costume With Round Gray Tunic
The ocean sunfish is one big round shape, which makes it simple to build and awkward to sit in if you oversize it. I cut the circular tunic from felt, quilted fabric or thin foam, with generous openings for the head and arms, and keep the circle no wider than my elbows so it clears doorways. Wear it over a fitted long-sleeve shirt and charcoal leggings, then add a tall fin at the top, a matching one at the bottom and a short scalloped tail. A neat bun or cropped silver wig, pale gray shadow, pearl highlighter and tiny white dots at the temples suit the soft palette. A bright yellow sun-shaped purse turns it into a pun, and silver flats or gray sneakers finish it.
21. Butterflyfish Costume With Yellow Striped Dress
Butterflyfish are one of the easiest tropical fish to make clean and neat, which is why I'd suggest it for school or work events. Start with a yellow A-line dress or a yellow top and leggings, then add narrow black diagonal stripes, a white side panel and the dark round spot near the back that real butterflyfish use to confuse predators. That eye spot is the detail most people skip, and it's the one that makes it read correctly. Soft triangular fins at the shoulders and a yellow tail edged in black finish the shape. A polished ponytail with yellow butterfly clips or a golden chin-length wig, sunny shadow and graphic black liner suit it. A coral-shaped clutch and black tights with yellow flats or white sneakers keep it comfortable all day.
22. Parrotfish Costume With Turquoise Scale Outfit
Parrotfish are the most colourful fish on this list, so the trick is to stop adding things. Start with a teal dress, jumpsuit, or top and leggings and layer curved felt scales in turquoise, pink, purple and green across the torso and hips. I overlap each row by about half a scale, like roof tiles, which hides the stitching and gives the surface real texture. Translucent blue fins and a rounded tail in the same mix complete the shape. A big turquoise ponytail with coral streaks or a wash-out hair colour, blue and purple shadow, a coral lip and pearly cheeks finish the face. Carry a craft-foam coral branch or shell purse, and wear teal sneakers or purple ankle boots. The scales already carry the look, so I keep accessories minimal.
23. Zebrafish Costume With Black And White Stripes
Zebrafish stripes only look graphic if they line up, and that's the part I measure. I mark the stripe positions with tailor's chalk across the side seams before applying anything, so the bands meet cleanly from the shoulders to the ankles. A fitted white jumpsuit, long-sleeve dress, or white sweatshirt and leggings is the base, with narrow black or navy fabric stripes, transparent fins edged in blue and a striped tail at the waist. Removable fabric tape or felt strips let you take it all off afterwards. A sleek black bob or a white ponytail with dark ribbon, crisp navy liner, white shadow and a berry lip keep the face crisp. A blue acrylic-style clutch and white sneakers with dark laces finish it.
24. Neon Tetra Costume With Blue And Red Outfit
Neon tetras glow in party photos because of contrast, so the base needs to be very dark. I use a black or deep navy jumpsuit and add one reflective blue stripe and one bright red stripe along each side; reflective fabric or a metallic vinyl picks up camera flash better than plain felt. Silver scales go down the centre, with small translucent fins at the shoulders and hips and a compact forked tail that keeps the shape without bulk. A straight black wig with blue clip-in pieces, or your own hair with matching ribbons, metallic blue liner and a red accent under the eyes suit it. A clear bubble purse with blue and red decorations inside and black sneakers with colourful laces keep it sleek.
25. Guppy Costume With Colorful Fan Tail
The guppy is really a showcase for one oversized fan tail, so that's where I'd put the work. I pleat organza in several bright colours into a wide semicircle and stitch it securely to a sturdy belt, because organza is light but a big tail still swings and pulls. Before the party, I walk through a doorway at home with it on; if it catches, I trim the width. Underneath, a fitted teal, purple or orange dress over matching leggings with small metallic scales around the bodice only, and matching shoulder fins to balance the back. A long ombré wig or high ponytail with rainbow ribbons, turquoise shadow, pink liner and iridescent highlight suit it. Low sneakers or flats in one of the tail colours keep it grounded.
26. Mackerel Costume With Blue Silver Stripes
Mackerel has a sporty, cool-toned look, and its wavy dark stripes across the back are its signature. I paint them freehand with fabric paint on a metallic silver tunic, fitted dress or sweatshirt rather than cutting felt, since the wavy lines are hard to cut cleanly. Navy leggings, a pale belly panel, a sharply forked tail and several small felt fins running along the back complete it. A sleek braid with silver cord or a short navy wig, blue-gray shadow, silver liner and a muted rose lip keep it polished. A silver bucket-shaped bag or cardboard wave is enough of a prop, with navy sneakers or slip-ons. Because the build is flat, it's one of the easiest here to wear under a coat on a cold night.
27. Blue Marlin Costume With Long Nose Headpiece
The marlin's long bill is the detail people recognise, and it's the one I'm most careful with. A cone pointing straight out from your face will hit someone the first time you turn your head, so I mount a lightweight foam cone with a rounded tip on a stable headband, angled upward from the forehead. The outfit is simple: a cobalt jumpsuit, midi dress or long tunic over black leggings, a silver-white belly, pale blue stripes, a tall dorsal fin and a crescent tail. A low braid tied with blue ribbon keeps hair out of the headband. Cobalt shadow, silver highlighter and clean white liner suit it. A wave-shaped clutch or blue ribbon streamers and silver sneakers or cobalt flats finish it.
28. Fish In A Bowl Costume With Clear Frame
A fish in a bowl adds a whole scene around a simple orange fish, and the bowl is easier to make than people expect. A clear umbrella held overhead is the quickest version; for a hands-free one, I bend flexible clear plastic into a loose circle on a light frame and wrap the lower part in blue cellophane. Paper gravel, plants and bubbles go around the bottom, leaving your face and arms open. Inside, an orange dress or sweatshirt with orange leggings, felt scales, soft fins and a small tail. Orange space buns or a curled copper wig, gold shadow and a coral lip suit it, with a tiny paper castle or fish-food prop. The bowl needs air gaps and should come off quickly, because clear plastic gets warm fast indoors.
29. Fish Out Of Water Costume With Beach Outfit
This pun costume pairs a full fish look with a deliberately dry beach scene, and the contrast is what sells the joke. A blue or silver scale-patterned dress over leggings carries side fins and a small tail, and over it goes a light tan vest or sash covered in paper sand, faux grass and a bright cardboard sun. A fish-eye headband makes the fish side clear. Beachy waves with blue extensions, turquoise shadow and silver scales at the temples tie in both halves. An empty water bottle with paper bubbles or a small “Out of Water” sign is the punchline, and oversized sunglasses help. Tan sneakers or flat sandals over nude tights keep it wearable, and nothing here needs a bulky frame.
30. Gummy Fish Costume With Red Tulle Dress
The gummy fish is a candy pun, and the trick is making felt look shiny and translucent like the sweet itself. I use glossy red vinyl or a satin-finish fabric for the scales instead of matte felt, which reads as sugary straight away. A bright red sweater dress, skater dress or long tunic over opaque red leggings is the base, with rounded side fins and a curved padded tail. A soft fish-shaped hood or headband with big cartoon eyes completes it. A glossy red bob wig or a high ponytail tied with clear ribbon, a light touch of red shadow, rosy cheeks and a glossy pink lip keep it sweet. Carry a clear candy-style bag filled with paper fish, and wear red sneakers or comfortable ankle boots for a family party.
Wearing Fins Through a Party, a Car and a Cold Walk
Most fish costumes don't fall apart; they just get in the way. A few checks at home save a lot of fiddling later.
- Sit in a chair and climb into the car while wearing it. If the tail or frame fights you, make it detachable.
- Walk through your narrowest doorway. Wide tails, hammerhead heads and sunfish circles should clear it without turning sideways.
- Raise your arms and reach for a cup. Fins that cover the hands or hang below the wrist get wet and dirty fast.
- Plan the coat. Flat builds like the mackerel or tuna slide under a jacket; a full pufferfish skirt won't, so layer thermals underneath instead.
- Pack a repair kit: safety pins, a needle and thread, and a few spare hook-and-loop tabs.
For the face, I always patch-test any new face paint or glitter on the inside of the wrist the day before. Shimmer and metallic shadow are lovely on a fish, but loose glitter migrates everywhere, so I press it on with a glitter glue or use a cream shimmer instead. A light dusting of setting powder over cream makeup cuts down on transfer onto collars and hoods, and an oil-based cleanser takes it off at the end of the night without scrubbing.
Getting Another Year From the Pieces
Because the scales and fins sit on a removable belt or are tacked on, most of these costumes come apart into a normal dress or hoodie again. Snip the tacking stitches, store the fins flat between sheets of tissue so the organza doesn't crease, and keep foam pieces in a box rather than a bag where they can bend. Next year, a set of orange scales becomes a goldfish one year and a koi the next.
One Tail, One Fin and a Detail People Spot
Every fish here comes back to the same few decisions: a base you're comfortable in, the colour that names the species, and the one detail people look for. Felt, organza, cardboard and craft foam give you the dimension without much weight, but each tail, headpiece and frame needs a test run at home before you walk into a crowd. If you're new to sewing, I'd start with the goldfish, blue tang or great white; if you like a challenge, the lionfish fins or the fish bowl will keep your evenings busy. Pick shoes you can stand in for hours and the rest of the costume will take care of itself.
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