Fish make some of the most forgiving kids' costumes there are: a colored sweatshirt, a few fins and a tail, and a child is suddenly a clownfish or a shark. Every idea below is planned head to toe, with a base outfit, fins, headwear, light face paint, a prop and shoes they can actually walk in. Most of the pieces come from felt, cardboard, craft foam, scrap fabric and reflective tape, so the same costume can do Halloween, a school event, an ocean party or book week. When I plan one for a child, my first checks are simple: can they walk, sit down and see clearly? Nearly all of these layer over a sweatshirt and leggings for a cold night. The list runs from cheerful clownfish and sparkling rainbow fish to an anglerfish with a glowing lure and a fish in its own bowl.
Felt Scales That Lie Flat and Stay Put
Almost every costume here uses scales, and they're the part that looks homemade in the wrong way when they're cut one at a time and glued on in a hurry. My approach is to cut scales in strips: fold a long band of felt, trace a row of half-circles along one edge with a cup, and cut the scalloped line in one go. Each strip then goes on as a single piece.
- Start at the bottom of the tunic and work up, overlapping each new row by about half a scale, the way roof shingles go on. That hides the straight top edge of every strip.
- Attach each strip along its top edge only, so the scallops hang free and move a little when the child walks.
- Sew or use fabric glue on a sweatshirt. Hot glue holds felt to felt, but on stretchy knit it cracks off as soon as the child bends.
- Make the tunic itself from two felt rectangles joined at the shoulders and tied loosely at the sides. It slips over a coat and comes off in seconds.
Craft felt sheds fibers and pills after a long night, while wool-blend felt holds its edges much better. For a costume a child will wear more than once, I think the blend is worth it.
1. Rainbow Fish Costume With Shiny Scales
The rainbow fish is the one kids who love sparkle tend to point at first. Begin with a blue sweatshirt and matching leggings, then cut large scalloped scales from blue, purple, green, pink and silver felt and attach them in overlapping rows to a simple fabric tunic. Add light fins at the shoulders and a fan-shaped tail at the back, plus a blue beanie with felt eyes so the face stays clear. I keep the shiny scales to the top half of the tunic; full-length metallic felt is stiff when a child sits down. Washable blue face paint at the temples with a touch of cosmetic glitter, silver sneakers and a shiny scale-shaped treat bag finish it.
2. Orange Clownfish Costume With White Stripes
Orange and white bands read as a clownfish from across a classroom, so the build can stay simple. Dress the child in an orange hoodie, orange joggers and comfortable black sneakers, then add wide white felt bands edged with narrow black strips across the hoodie and legs. That thin black edge is what I never skip; without it, the stripes look like a construction cone. Padded orange fins go on the sleeves and a rounded tail on the back of the hoodie, with large felt eyes on top of the hood instead of a mask. A little orange paint on the cheeks and a blue cardboard sea-anemone bucket with ribbon tentacles round it off.
3. Goldfish Costume With Orange Tulle Fins
Tulle gives a goldfish fins that float as the child moves, with almost no weight. Start with an orange long-sleeve shirt, leggings and a sleeveless orange tunic covered in overlapping gold and orange felt scales. Gather strips of orange tulle at the shoulders, wrists and back to form the fins and a wide tail. I cut every strip short enough that it can't reach the shoes, because tulle underfoot is how kids trip on stairs. Long hair can go in a high ponytail with orange ribbons, or add a soft headband with round fish eyes. Peach face paint, gold freckles, orange sneakers and a small bubble wand complete the underwater feel.
4. Blue Tang Fish Costume With Yellow Fins
The blue tang works because of one bold contrast: royal blue against bright yellow. Use a blue sweatshirt and leggings, then layer a sleeveless oval tunic over the top with a curved black felt marking on each side. Yellow foam or felt suits the side fins, back fin and pointed tail. I attach the fins to the tunic rather than the sweatshirt, which leaves arms and knees completely free and lets you wash the base separately. A blue hood with soft eyes and a short fin finishes the head. A sweep of blue paint beside the eyes, yellow sneakers and a small coral-shaped candy bag pull it together.
5. Round Pufferfish Costume With Soft Spikes
A pufferfish should look round, not sharp. Build the shape on a tan oversized sweatshirt or a lightweight fabric poncho stuffed gently along the edges, then cover the body, sleeves and hood with short triangular spikes in soft felt or craft foam. Add a cream belly panel, round side fins and a small fan tail. The hood can carry wide cartoon eyes and puckered felt lips above the forehead. Tan leggings, cushioned sneakers and a few painted freckles keep the rest simple. Stuffing is the part I'm stingiest with: too much and the child can't bend to climb stairs or pick up a treat.
6. Anglerfish Costume With Light-Up Lure
Kids who love deep-sea animals tend to fall for the anglerfish because of its glowing lure. Choose a navy hoodie, dark-blue leggings and blue sneakers, then add overlapping foam scales, rounded side fins and a large navy-and-teal tail. Soft triangular felt teeth can line the hood opening, kept clear of the eyes and mouth. Make the lure from a flexible headband, a pipe cleaner and a small battery light inside a translucent pom-pom. I wrap the battery compartment with tape so curious fingers can't open it mid-evening. Blue and silver paint on the cheeks and a small glowing bucket that matches the lure do the rest.
7. Betta Fish Costume With Flowing Fins
Long rippling fabric makes a betta look grand while staying easy to wear. Start with a red, blue or purple leotard over matching leggings and a fitted long-sleeve shirt, then attach lightweight chiffon panels along the arms so the fins open when the child lifts their hands. Shorter panels at the hips and a layered fan tail at the waist complete the body. Chiffon frays fast, so I run a quick zigzag or a line of fray stopper along each cut edge first. A fitted cap with soft fish eyes keeps the face visible, and washable paint in the costume colors blends at the temples. Ballet flats or flexible sneakers suit indoor events; trim every panel above the ankle.
8. Koi Fish Costume With Red Markings
White and red koi markings look clean and striking at school celebrations and parties. Begin with a white hoodie, white pants and slip-resistant white sneakers, then cut irregular red and black felt patches and arrange them across a fish-shaped tunic. Real koi patches are never symmetrical, so I lay them out unevenly on purpose before attaching any. Add soft white fins edged in red at the sleeves, shoulders and back, and a rounded tail on snaps so it comes off for car rides and seated activities. Large eyes and short felt whiskers go on the hood, with red accents only at the temples. A blue pond-style treat bag finishes it.
9. Great White Shark Fish Costume
A great white can be exciting for a child without frightening younger kids at the door. Dress the child in a gray hoodie, matching sweatpants and sturdy gray sneakers, then sew a white belly panel down the front and attach a tall foam fin to the back of the hood. Add smaller fins on the sleeves and a crescent tail at the waist. Soft white felt teeth frame the hood opening while leaving the whole face visible, and two small gray lines on each cheek suggest gills. I'd make any cardboard surfboard prop small, with rounded edges and a comfortable handle. Reflective strips help drivers see the gray after sunset.
10. Hammerhead Shark Fish Costume
The hammer-shaped head is the whole costume, so I spend my time there and keep the body plain. Use a gray tracksuit with a white felt belly from chest to waist. Build the headpiece from lightweight foam, narrow enough to pass through doorways and crowded hallways, with soft eyes at each end that don't touch the child's own field of view. A dorsal fin goes on the hoodie and small side fins on the sleeves, and a flexible gray tail fastens to the waistband with hook-and-loop tape. Gray cheek shading with painted gill marks, gray athletic shoes and a blue ocean-print bucket finish it without competing with the head.
11. Whale Shark Fish Costume With White Spots
Deep blue with a neat pattern of pale spots gives a whale shark a gentle, giant look. Begin with a navy sweatshirt, navy joggers and comfortable blue sneakers, then add rows of white felt circles and short lines across the back, hood and sleeves, with a lighter blue belly panel down the front. Broad side fins under the arms, a small dorsal fin and a wide tail complete the shape. The hood's mouth should be broad and soft-padded, with no teeth at all. I continue the spot pattern with a few white face-paint dots along the cheeks. A plush starfish or small ocean-print bag adds a child-friendly prop.
12. Swordfish Costume With Soft Nose
A swordfish looks sleek and fast built on a blue athletic outfit. Choose a cobalt hoodie, fitted joggers and lightweight running shoes, then add a silver belly panel, a tall back fin, two narrow side fins and a deeply forked tail. The nose needs the most thought: make it from soft rolled felt or flexible foam, attach it to a cap above the forehead, and keep it short and bendable. I bend it with my hand before every outing; if it springs back hard, it's too stiff for a crowd of kids. Fabric eyes go on either side of the cap, with silver paint at the temples and a bubble-print drawstring bag for treats.
13. Lionfish Costume With Striped Fins
Striped fins that fan out make the lionfish a showpiece. Dress the child in a red-and-white striped shirt, red leggings and white sneakers, then create broad fan-shaped fins from pleated fabric or felt in burgundy, cream and coral stripes. Attach them along the arms and back so they spread when the child poses and fold down for walking. Pleating is the trick I'd use here; it lets a big fin collapse flat against the arm. Add smaller fins around a soft headband with large eyes, and skip stiff points that catch on furniture. Coral paint swept outward from the eyes, a shell bucket and a short red tail tie it together.
14. Seahorse Fish Costume With Curled Tail
The seahorse depends on its curled tail, so that's where I start. Use a yellow, aqua or coral hoodie with matching leggings and a textured belly panel made from overlapping felt strips, plus soft scalloped fins running from the hood down the back. Form the curled tail from stuffed fabric with a wire-free center and attach it at the waist so it sits behind the legs. Stitching the curl into place with a few hidden tacks holds the shape better than stuffing alone. The hood carries a short rounded snout and gentle fabric eyes. Face-paint dots on the cheeks, a simple ponytail, matching sneakers and a sea-grass wand are the last touches.
15. Tuna Fish Costume With Silver Sides
A silver tuna suits kids who want a streamlined look over ruffles or sparkle. Begin with a gray long-sleeve shirt, black or navy leggings and silver sneakers, then make an oval tunic from metallic gray fabric with a darker blue back and a pale belly. Add short side fins, a row of small finlets near the waist and a firm but flexible forked tail. A silver beanie holds large felt eyes and a small top fin. Metallic fabric frays and slips under the machine foot, so I cut it with a little extra seam allowance. Brush silver makeup lightly on the temples, and for a joke, let them carry a plain cardboard “tuna can” bucket with no brand labels.
16. Sardine Fish Costume With Tin Prop
The sardine gets its laugh from the tin, so keep the fish itself simple. Dress the child in a metallic silver tunic over a gray shirt, leggings and sneakers, with blue-green felt scales, small side fins, a pointed tail and a fitted cap with fabric eyes. Keep the fish body narrow so they move easily through doorways. Build an open sardine-tin frame from lightweight cardboard covered in silver paper and hang it from shoulder straps so it rests around the waist. I round every cardboard corner with scissors and tape the edges, because cut card is surprisingly sharp. Blue cheek accents and slicked-back hair finish it, and a silver bucket with a lid holds treats.
17. Catfish Costume With Soft Whiskers
Whiskers give a catfish its personality, and they must always be soft. Use a charcoal-gray hoodie, matching pants and dark slip-resistant sneakers, plus a pale gray belly, rounded side fins and a broad lightly padded tail. Attach short yarn or felt whiskers to the hood beside the cheeks, never across the mouth, where kids chew them. Two large eyes and a curved smile sit above the hood opening, with small gray gill marks near the jaw in washable paint. A fish-shaped treat pouch is a handy accessory. If your child likes a pun, I'd add removable felt cat ears for a cat-and-fish joke that still reads clearly.
18. Flying Fish Costume With Wing Fins
A flying fish needs wide fins that look ready to glide. Start with a bright blue shirt, fitted pants and lightweight sneakers, then add a silver-blue tunic with a pointed nose shape above the forehead and a forked tail at the back. The winglike fins come from semi-sheer blue fabric stretched between sleeve and body, ending above the knee so the child can run and climb. I'd use a stretch mesh rather than woven chiffon here, since it moves with the arm instead of tearing at the seam. A blue headband with soft eyes and a small fin, shimmering blue at the temples and a cloud-and-wave treat bag round it off.
19. Electric Eel Fish Costume With Neon Stripes
An electric eel turns a plain black outfit into something bright. Dress the child in a black hoodie, leggings and athletic shoes, then layer a long flexible eel-shaped panel down the back, ending in a rounded tail above the ankles. Neon yellow and blue zigzag strips across the sleeves, chest and tail stand for the sparks, and reflective tape gives the same effect with better visibility at night. Large friendly eyes go on the hood, with small side fins near the shoulders. Two yellow lightning shapes on the cheeks are easy to paint. I'd add a glow bracelet and a lightning bucket but leave off flashing lights and loose cords near the face.
20. Manta Ray Fish Costume With Wide Fins
A manta ray is mostly two wide wings, and getting their width right is what I think about first. Begin with a black or dark-navy sweatshirt, leggings and matching sneakers, then attach triangular fabric fins from each sleeve to the sides of the body with enough slack for the arms to move. Add a pale belly panel underneath and a short flexible tail. A soft hood can carry two small raised eyes and gently curved front fins above the forehead. Keep the widest points floppy so the child can fold them to pass through doors. Silver paint along the cheekbones and a ribbon streamer or bubble bag add motion.
21. Stingray Fish Costume With Spotted Wings
Spotted fleece wings make the stingray playful rather than intimidating. Choose a gray long-sleeve top, gray pants and secure sneakers, then cut a broad diamond-shaped cape from fleece or felt with pale spots across the top. Fasten it at the shoulders and wrists so the child can spread the wings for pictures. Fleece is my pick for this one, since its cut edges don't fray and need no hemming. A short padded tail should end well above the floor, and a gray cap with raised eyes and small curved fins finishes the head. Silver dots beside the eyes, a shell bracelet and an ocean-blue bucket leave the hands free when needed.
22. Tropical Fish Costume With Bright Stripes
The tropical fish leaves the color choices to the child, which is half the fun. Start with a turquoise shirt, purple leggings and bright sneakers, then cover a lightweight tunic with curved bands of pink, yellow, orange and blue felt. Add a tall top fin, small side fins and a large fan tail in the same colors, plus a headband with round eyes and one tiny fin that won't flatten their hair. I let kids pick the stripe order themselves; they wear a costume much longer when they had a say in it. Two blended colors at the temples, short wrist ribbons and a bucket with felt coral and sea grass do the rest.
23. Blue Marlin Fish Costume With Tall Fin
A blue marlin pairs a pointed profile with a tall striped back fin. Dress the child in a royal-blue hoodie, gray pants and supportive blue shoes, and add a silver belly with thin pale-blue stripes along a streamlined tunic. Make the dorsal fin from flexible craft foam covered in fabric and stitch it down the back, not just at the top, or it flops sideways. A short bendable nose sits on the hood above the forehead, well clear of the eyes. Narrow side fins and a crescent tail complete the shape. Silver-blue paint at the temples, slicked hair and a wave-print drawstring bag tie it together.
24. Pink Salmon Fish Costume
The pink salmon is a good first sewing project, simple but still polished. Begin with a dusty-pink sweatshirt, gray leggings and pink or silver sneakers, then add a lighter belly panel and scattered dark spots across the back and shoulders. Rounded side fins, a small top fin and a broad forked tail give the shape. If you want a fuller body, stuff a sleeveless tunic lightly, but I'd stop well before it gets rigid. A pink beanie with fabric eyes is comfortable headwear. Rosy cheeks with a few silver dots keep the makeup subtle, and a blue felt river bag with a sturdy handle suits a school day.
25. Green Bass Fish Costume
Olive greens make a bass look realistic while staying fun. Use an olive hoodie, dark-green joggers and brown or green sneakers, then add a pale cream belly and a jagged horizontal stripe along each side of a padded fish tunic. Sew a row of soft triangular fins down the back and smaller fins near the shoulders. The tail should be broad and flat and sit high enough to clear the legs; I check that by having the child walk up a couple of stairs in it. Fabric eyes and a rounded mouth go on the hood, with light green cheek shading. A pond-style bucket with a felt lily pad on the handle finishes it.
26. Fish In A Bowl Costume
The fish in a bowl turns a basic orange fish into a clever three-dimensional joke. Dress the child in an orange hoodie, leggings, sneakers and a small felt tail, with round eyes on the hood, soft side fins and orange face-paint scales on the cheeks. Build the bowl as a large circular frame from flexible tubing or lightweight cardboard, covering only the lower part with blue fabric. The top must stay completely open; I'd never wrap a child in clear plastic, however good it looks. Felt bubbles, pebbles and sea plants decorate the blue panel, padded shoulder straps carry the frame, and a small blue bucket holds treats.
27. Fish Stick Pun Costume
The fish stick is an easy visual joke made from light homemade pieces. Start with a tan sweatshirt, matching pants and brown sneakers for the crispy coating, then attach a white felt fish shape to the front with simple fins, scales and a tail so the fish part reads clearly. Make a large “stick” from a foam pool noodle wrapped in brown paper, or sew several short felt sticks across the tunic like stripes. Pool noodles are my go-to for props like this because they weigh almost nothing and can't hurt anyone they bump. A tan beanie with fish eyes, golden painted freckles and a red pouch as the dipping sauce finish it.
28. Neon Glow Fish Costume
Neon colors keep this fish bright in daylight and visible after dark. Begin with a black sweatshirt, joggers and reflective sneakers, then layer neon pink, lime, blue and yellow felt scales across a sleeveless tunic, with matching fins on the arms and a bright fan tail at the waist. I outline some scales with reflective tape instead of relying only on lights, because tape keeps working when batteries die. A black headband with neon eyes and a short fin leaves the face open. Use washable, child-safe face paint for UV-style dots, fit glow bracelets snugly, and carry a reflective bucket with bubble and fish shapes.
29. Cardboard Box Fish Costume
A cardboard box fish is cheap to make, and kids love decorating it themselves. Pick a box that fits loosely around the torso, cut generous openings for the head and arms, and cover every cut edge with tape. Paint it blue, orange or green and add paper scales, a large side eye, light fins and a tail. Underneath, a coordinating long-sleeve shirt, leggings and sneakers, plus a fish-eye headband and cheek scales, keep the costume complete when the box comes off. I hang the box from wide fabric straps rather than string, which cuts into shoulders. A mini cardboard fish on the treat bucket finishes the handmade look.
30. School Of Fish Group Costume
A school of fish is a clever group idea for siblings, classmates or friends. Give each child a different colored sweatshirt, leggings and comfortable sneakers, then add matching felt scales, side fins, tails and fish-eye headbands. Use the same basic pattern across the group so they clearly belong together. To make the pun literal, each child wears a light cardboard book, pencil, number or letter on the front. I cut all the scales from one template for the whole group, which is what makes four different colors look like one school. Matching face-paint scales, fish-shaped treat bags and a parent in blue holding a cardboard class roster finish the scene.
Tails and Fins Through Doors, Car Seats and Classroom Chairs
A fish costume is mostly things that stick out, and a child spends Halloween squeezing through doors, sitting in car seats and perching on classroom chairs. I make every tail removable and keep fins soft enough to fold.
- Attach tails with large snaps or a strip of hook-and-loop tape at the waistband, never sewn permanently, so they come off for the car.
- Keep tails above the back of the knee; anything lower gets stepped on by other kids.
- Pull fins in to roughly shoulder width for school days, when hallways are crowded and desks are close together.
- Choose fleece or felt over cardboard for anything on the arms. Cardboard creases after a few hugs and can't take rain.
Washable Paint That Comes Off at Bedtime
Most fish faces here need only a few dots or a sweep at the temples, which is kind to young skin. I test any face paint on the inside of the wrist the day before. Water-activated cake paint sits lighter than cream and creases less, and a dusting of translucent powder keeps cream paint from transferring onto hoods. Stick to cosmetic glitter, never craft glitter, and keep it away from the eyes. At bedtime, a little baby oil or gentle cleanser on cotton wool lifts the paint without scrubbing.
Fins On, Face Clear, Ready to Swim
A fish costume can suit almost any age, budget, skill level or dress-up day. A familiar tracksuit becomes a simple fish with felt fins, while fabric scales, flowing tails, reflective details and light props build up to something more elaborate. Keep the face open, the materials flexible, the attachments secure and the shoes ones your child already likes. Removable tails and fins make car rides and classroom chairs much easier. Let kids choose colors and help decorate scales, and they'll wear the result with pride. A sparkling rainbow fish, a funny fish stick or a whole school of fish all work best when the child can move freely.
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