Boo is a sweet character to dress because her look is mostly color and hair: a long pink T-shirt worn like a nightshirt, lavender leggings, white socks and two short pigtails. Her purple monster disguise is there for anyone who'd like a bigger craft project. I dress toddlers as Boo most often, but the look scales up well to teens, adults, plus-size wearers and expectant parents. Below are quick closet versions, handmade disguises and coordinated groups, each with notes on what keeps it comfortable for walking, photos and trick-or-treating.
How Big Should Boo's Shirt Be?
Her shirt is the whole silhouette, so sizing matters more than the exact shade. On the character it reaches roughly to the knees and the sleeves fall past the elbows, which is what makes her look so small.
- For toddlers and young kids, I go up two or three sizes in a plain cotton tee. Roll the sleeves once and tack them with a stitch if they cover the hands.
- For older kids and adults, a T-shirt dress gets the length without a neckline that drapes too low. Check it in a mirror while bending over, because a giant tee can gape at the neck.
- Choose a clear, medium pink rather than hot pink or pale blush. Very pale pink washes out next to lavender leggings, and the pair stops reading as her colors.
- Hem the shirt above the knee for stairs. A long nightshirt catches on porch steps when a small child climbs.
The leggings should be a true lavender or light purple, not dark plum, so the two colors still read as a pair from across the street.
1. Classic Boo Costume With Pink Shirt
The classic version is where I'd start, since it needs almost no crafting. Choose an oversized pink T-shirt that falls near the knees, then add lavender leggings, plain white ankle socks and white sneakers or soft slip-ons. Two short pigtails, a little uneven like a real toddler's, sit best just above the ears; secure them with colorful ball hair ties. Rosy cheeks and pink lip balm are enough makeup. A small blue furry monster plush or a light purple door cutout tells people who she is. It's an easy fit for kids, petite adults and anyone short on time.
2. Adult Boo Costume With T-Shirt Dress
For adults I'd swap the child-sized top for a loose pink T-shirt dress, which gives the oversized look without being too short. Opaque lavender leggings or stretchy purple tights, white crew socks and clean sneakers keep the palette. Keep the pigtails small and close to the sides of the head; high ones push the look toward a different character. A short black wig does the job if your hair won't cooperate. Fresh blush, natural mascara and a glossy lip are plenty. A mini purple door purse or a blue faux-fur shoulder bag carries your phone and doubles as the prop.
3. Toddler Boo Costume With Purple Leggings
Toddlers are the true Boo age, so this one practically dresses itself. A roomy pink cotton tunic over lavender leggings gives the shape, and nonslip socks with flexible sneakers keep them steady on porch steps. Use soft, snag-free elastics for the tiny pigtails; ball ties with hard plastic beads can pinch fine hair. Child-safe cheek color is optional. A small plush monster is the one prop most toddlers will carry happily all night. I leave out anything rigid or large, and I pick leggings with an easy waist for diaper changes.
4. Baby Boo Costume With Pink Romper
For a baby, a soft pink romper that snaps underneath replaces the long shirt and keeps everything in place. Lavender footed tights or stretchy leggings go underneath, with white crib shoes or nonslip socks. If there's enough hair, two tiny pigtails with gentle fabric elastics are adorable; if not, a soft headband with black yarn pigtails sewn on gets the look without tugging. Keep the face natural and nothing loose near the mouth. A small blue plush can sit beside the baby for supervised photos. It's a cozy first-Halloween costume for a stroller walk or a portrait.
5. Teen Boo Costume With Pink Sweatshirt
Teens tend to like this as a sweatshirt version. An oversized crewneck in a medium rose shade over lavender biker shorts, leggings or straight sweatpants keeps it casual, and white high-tops with crew socks finish the base. Two mini pigtails with a few wispy pieces around the face look relaxed rather than babyish. Pink blush, clear gloss and a fine line of lavender liner suit the age. A crossbody bag decorated like the purple bedroom door holds a phone, and a blue furry keychain clipped to it is the monster nod. It's an easy pick for spirit day or a theme park.
6. Plus Size Boo Costume With Pink Dress
Boo's look doesn't need a tent-sized shirt to work. A relaxed pink swing dress or soft T-shirt dress falling above the knee gives the oversized feel with a better line. Wear it over high-rise lavender leggings with a supportive waistband so nothing rolls down while you walk. White platform sneakers add comfort and a bit of shape. Your own hair or a light black wig in two small bunches gives the pigtails. Rosy blush, defined lashes and a pale pink lip are plenty. Carry a structured purple door bag or a blue plush; the colors and hair do most of the work.
7. Maternity Boo Costume With Stretchy Pink Dress
Boo's loose shape suits a bump naturally. A pink maternity T-shirt dress with side ruching or plenty of stretch through the middle, lavender maternity leggings and cushioned white slip-ons make a base you can wear for hours. Two relaxed pigtails with pom-pom elastics keep the hair playful. Cream blush and moisturizing lip color look fresher than powder later in the evening. A tiny blue faux-fur bag adds the monster without weight, or carry a light purple door sign. It works nicely in family photos where an older sibling is dressed as one of the monsters.
8. Last-Minute Boo Costume From Closet Basics
Same-day Boo is very doable from your own drawers. A long pink T-shirt, sleep shirt or casual mini dress works over purple leggings, lilac pajama pants or opaque tights. White socks and whatever white sneakers are most comfortable finish the base. Two low mini pigtails with bright elastics and a little blush take a couple of minutes. Grab a blue stuffed animal if you have one. A sheet of purple poster board with a drawn doorknob and simple flowers makes a quick door prop. No sewing, no ordering, and she's still clearly Boo.
9. No-Sew Boo Costume With Felt Details
This is a nice craft for an older child to help with. Start with a pink T-shirt dress, lavender leggings, white socks and sneakers. Cut simple door shapes from purple felt and attach them to a small fabric bag with removable adhesive strips, and add blue felt spots to a fuzzy turquoise scarf for a monster accessory. Pigtails with pom-pom ties and round pink cheeks finish the face. For more detail, glue gray yarn and white felt teeth onto a separate purple hood. I use fabric glue rather than hot glue on anything a child will squeeze, because hot glue pops off felt when it bends.
10. Thrift Store Boo Costume With Monster Plush
Thrift stores have this whole costume hiding in the sleepwear racks. Look for a roomy pink nightshirt or top and lavender leggings or pajama bottoms, then check the kids' and accessory sections for white sneakers and a small blue stuffed creature. Wash everything before wearing, and roll or hem anything too long. Two short pigtails with round ties and a little pink blush finish the face. If the plush is the wrong color, removable purple felt spots fix that. A slightly mismatched, collected look actually suits Boo, who dresses like any toddler at bedtime.
11. Boo Costume With Purple Monster Disguise
The purple monster disguise is the version for families who enjoy a craft weekend. Build the body from a roomy purple tunic or sleeveless poncho over gray long sleeves and gray pants. Add pale spots, soft tentacle-style arms and an open hood with white felt teeth. Eye stalks made from flexible pipe insulation topped with light foam balls bend when bumped, which matters in a crowd. Gray sneakers blend into the creature shape. Leave the pigtails visible through the hood opening so the person inside is still Boo, and carry a blue plush or the purple door.
12. DIY Foam Boo Monster Costume
Foam gives the disguise its rounded, cartoon shape without much weight. Over a gray shirt and leggings, wear a light purple fabric body, then use thin upholstery foam for a curved hood and soft tube arms, each covered in matching fabric. White felt teeth go around the face opening and flexible eye stalks sit above. Nonslip gray athletic shoes keep a child steady. Before the night, I have the wearer walk through a doorway, sit on a chair and reach up for a high five; if any of those is hard, trim the foam. A hidden front opening makes dressing much faster.
13. Fleece Boo Monster Costume For Cold Weather
Fleece is the best fabric for a cold-night disguise because it's warm, doesn't fray and needs no hemming. Use a purple fleece poncho or hooded tunic for the body with gray thermals underneath. Add pale lavender spots, white felt teeth and soft stuffed arms near the sides, plus two light eye stalks on the hood; keep them balanced so the hood doesn't tip backward. Fleece-lined gray sneakers or ankle boots and thin gray gloves keep hands and feet warm. Pink cream blush stays comfortable in cold air, where powder can feel dry. It's warm enough for parades and long trick-or-treat routes.
14. Lightweight Boo Monster Costume For Warm Weather
In a hot climate, the monster shape needs to come in pieces. A sleeveless lavender shift or loose purple cotton tunic, light felt spots and short fabric arms replace thick padding. A separate open-face hood made from thin craft foam covered in purple fabric, with small felt teeth and flexible eye stalks, can come off the moment a child looks flushed. Gray bike shorts underneath prevent chafing, and breathable gray sneakers handle the walking. Keep makeup to rosy cheeks. A blue furry crossbody pouch can carry a water bottle, which a kid in a costume will need.
15. Boo Costume With Purple Door Prop
The door is the prop that tells the story, so it's worth making well. Wear the oversized pink shirt, lavender leggings, white socks, white sneakers and two short pigtails with bright elastics. Cut the door from light foam board and paint it lavender, adding white flower shapes, a darker border and a painted foam doorknob. Keep it narrower than the child's shoulders and glue a hidden handle to the back. For a child who'll also be holding a treat bag, a mini door-shaped crossbody bag works better than a big prop. Either way, people get the bedroom-door scene at a glance.
16. Boo Costume With Blue Monster Backpack
A blue furry backpack is the practical choice for a long night, since it carries the candy as well as the theme. A knee-length pink T-shirt dress over lavender leggings, white crew socks and cushioned sneakers form the base, with short pigtails and colorful ball ties. Cover a small backpack with removable turquoise faux fur and add large purple felt spots and two soft horns. I'd skip a detailed monster face on the bag; it gets squashed against the back and looks odd. Inside go candy, water, a phone and spare hair ties, and it handles a whole theme park day.
17. Boo Pajama Costume With Purple Joggers
Boo spends the film in what's basically pajamas, so this version is honest to the character. An oversized pink sleep shirt with good length and lavender joggers or loose pajama pants make the base, with white crew socks and soft slip-ons if you'll be outside. Messy mini pigtails look right here. A touch of cream blush and tinted balm is all the makeup. Carry a blue furry pillow or plush monster. For extra warmth, a fitted gray thermal under the pink shirt disappears visually. It's my pick for movie nights and sleepovers.
18. Boo Tutu Costume With Pink Top
A lavender tutu makes Boo party-ready, and little ones who love to twirl tend to keep it on. Layer a loose pink short-sleeve top over a knee-length tulle skirt and opaque purple leggings, then add white ankle socks and white ballet-style sneakers or flats with secure straps. Decorate the two small pigtails with pink and purple ties. Keep makeup to rosy cheeks and pale gloss. A blue furry drawstring bag or a mini purple door strengthens the character link. Check the tutu's waistband: unlined elastic itches, and an itchy child pulls the whole skirt off before the party is over.
19. Boo Skater Dress Costume
A pink skater dress gives Boo a bit more structure while keeping her simple outline. Choose a casual cotton dress with short sleeves and a gently flared skirt, over lavender tights or leggings, white crew socks and low white sneakers. Keep the pigtails compact near the sides of the head. If your hair is short, two small clip-in ponytails do the job without a full wig. Round pink blush and a soft neutral lip finish the face. A small blue faux-fur bag with removable purple spots is the accessory. The flared skirt looks neat in photos and moves easily on a dance floor.
20. Boo Hoodie Costume With Pigtails
When comfort comes first, an oversized pink hoodie takes over from the T-shirt. A long hoodie or sweatshirt dress over plain lavender leggings, with white high-tops and thick white socks, handles plenty of walking. Wear the hood down so the two short pigtails stay visible, held with pink ball ties or fuzzy pom-poms. Noticeable rosy cheeks and a little lavender liner suit teens and adults. Carry a purple door-shaped tote or clip a blue furry charm to a small backpack. Pick a hoodie without a printed logo, because a big graphic pulls the eye away from the colors.
21. Boo Overall Dress Costume
A pink pinafore gives Boo an everyday twist. Layer a plain pink corduroy or cotton overall dress over a matching short-sleeve tee, then add lavender leggings, white socks and rounded white sneakers. Leave the ends of the two small pigtails slightly messy for a childlike look. Soft pink blush and clear balm are enough. A tiny purple door patch on the front pocket, attached with removable fabric tape, is a sweet detail. The shape is more fitted than her original shirt, so the colors and hair carry the character here, and it's easy to wear to school or work.
22. Boo Costume With Pink Raincoat
On a wet night, let the raincoat be the costume. A simple pink raincoat over a lavender top and leggings, with white waterproof sneakers or short rain boots with good grip, keeps the colors visible. Protect the pigtails with a clear hood or a child-size transparent umbrella. Waterproof mascara and cream blush hold up better than powder in damp air. A small purple umbrella with removable white flowers nods to her bedroom door. Pack dry socks in a blue furry backpack; wet socks end a child's night faster than anything.
23. Boo Costume With Lavender Sneakers
Lavender sneakers bring the purple down to the feet and give Boo a streetwear feel. Wear an oversized pink T-shirt dress over light-purple bike shorts or leggings, with white crew socks rising above the shoes so the original palette stays intact. Pink and purple pom-pom ties for the pigtails, plus rosy blush, gloss and a subtle lavender eyeshadow, keep the colors linked. A compact blue fuzzy shoulder bag with darker purple spots and a small door tag on the strap finish it. Matching shoes and hair ties make a simple outfit look deliberately styled in photos.
24. Glam Boo Costume With Purple Makeup
A glam Boo keeps the character but dresses it up for an adult party. Choose a silky pink T-shirt dress or soft velvet mini over opaque lavender tights, with white platform sneakers for height and stability. Tie two smooth pigtails with glossy pink hair balls, and add a few pearly clips if you like shine. Lavender shadow, fine purple liner, curled lashes, pink blush and rose lips give the polish. I'd steer away from grown-up accessories like heels or statement jewelry, which fight the toddler character. A sparkly purple door clutch with a blue faux-fur charm keeps it playful.
25. Y2K Boo Costume With Pink Mini Dress
The film came out in the early 2000s, so a Y2K Boo fits nicely. A pink baby-doll mini dress over lavender capri leggings, white ribbed socks and chunky white sneakers set the era. Two small pigtails with colorful bubble ties keep it cute, and small butterfly clips can frame the face without replacing the pigtails. Shimmery lavender shadow, pink blush and glossy lips suit the period. Carry a tiny blue furry shoulder bag with a purple door keychain. It's a fashion take rather than a replica, but the colors and hair still say Boo.
26. Short Hair Boo Costume With Pigtail Wig
Short hair is no obstacle. A light black bob wig with two small pigtail attachments, trimmed so the fringe and lengths sit naturally, recreates her hair. Wear it with a loose pink T-shirt dress, lavender leggings, white ankle socks and sneakers. Round pink-and-purple elastics over the attachments hide the join. Keep makeup simple with rosy cheeks and pink balm. A blue monster plush or a purple door bag finishes it. Secure the wig with a breathable cap and a few hidden pins; on kids, I'd clip small pigtails into their own hair instead, since a full wig gets hot and itchy fast.
27. Curly Hair Boo Costume With Mini Pigtails
Curls give Boo's pigtails extra bounce. Section the front and sides into two small pigtails and leave some curls loose at the back, using soft pink elastics and no brush, so the texture stays defined. Wear an oversized rose-pink tunic, lavender leggings, white socks and flexible sneakers. Pink cream blush, a little mascara and lip balm suit the look. A purple door purse or blue plush is the accessory. Outdoors, a little curl cream or light-hold gel keeps the pigtails from frizzing out of shape by the end of the night.
28. Natural Hair Boo Costume With Puff Pigtails
Two compact puffs make a lovely Boo hairstyle on textured natural hair. Part moisturized hair down the center and secure each section gently near the sides of the head with fabric-covered ties or round pink clips; tight elastics pull at the edges, especially on children, so keep them loose. A loose pink cotton dress, opaque lavender leggings, white socks and supportive sneakers make the outfit. Warm pink blush and a moisturizing gloss are plenty. Carry a blue fuzzy mini backpack with purple felt spots or a light lavender door prop. The puffs give the same double-pigtail outline at any age.
29. Kids Boo Costume With Light-Up Door Prop
A softly glowing door helps a child stand out on a dark street without anything scary about it. Dress them in a pink cotton tunic, lavender leggings, white socks and sneakers with reflective details, plus two small pigtails. Cut a mini purple door from foam board and outline it with battery-powered LED wire, which stays cool to the touch. Close the battery pack inside a pouch on the back and add a wrist strap so the door can't drag. A blue furry treat bag holds the candy. Test the lights the night before; a dead battery at the first house is a sad start.
30. Boo And Blue Monster Couple Costume
Boo and the big blue monster are the obvious pair, and people connect them straight away. Boo wears an oversized pink T-shirt dress, lavender leggings, white socks, white sneakers, short pigtails, rosy cheeks and a purple door purse. The partner wears a turquoise faux-fur jacket over matching pants, with large purple spots, soft horns and blue sneakers. Blue-and-purple makeup around the eyes keeps the face visible instead of hidden under a mask. A padded tail fixed with hook-and-loop tape finishes the monster. For photos, Boo holds the door and the monster carries a clipboard like a factory employee.
31. Boo And Green Monster Duo Costume
The green one-eyed monster gives strong contrast next to Boo's pink. Dress Boo in a long pink tee, lavender leggings, white socks, white sneakers and two mini pigtails with colorful ties, with rosy cheeks and a small blue furry bag. The partner wears a bright green sweatshirt and joggers with a large white-and-green felt eye on the chest, a soft horn headband, green makeup at the temples and green sneakers. I'd make the eye from two layers of felt with thin batting between, so it stays round instead of curling at the edges. A clipboard or toy microphone is enough prop, and the pair suits friends, siblings or a parent and child.
32. Boo Blue Monster And Green Monster Group Costume
Three people make the full monster-factory scene. Boo wears a pink T-shirt dress, lavender leggings, white sneakers, small pigtails and rosy cheeks, and carries the purple door. The blue monster wears turquoise faux fur with large purple spots, soft horns, matching pants and blue sneakers. The green monster wears a bright green top and pants, an oversized felt eye, a flexible horn headband and green shoes. Keep every face uncovered and let makeup carry each color. Matching cardstock employee badges link the three. It's a natural fit for two adults with a little one as Boo.
33. Boo Family Costume With Monster Crew
A family can fill a whole monster crew around one small Boo. Dress the youngest in a pink tunic, lavender leggings, white sneakers, pigtails and rosy cheeks. One adult wears a blue spotted faux-fur vest and soft horns, and another a green outfit with one large felt eye. Anyone else can wear purple, coral or orange monster hoodies with friendly felt eyes and flexible horns. Simple employee badges and comfortable sneakers pull everyone together, and a light purple door connects the scene. Keep makeup soft and skip masks, so grandparents and toddlers alike can see where they're walking.
34. Boo And Blue Monster Pet Costume
Keep Boo as the main costume and let the dog join as the blue monster. The person wears a pink T-shirt dress, lavender leggings, white socks, white sneakers, two small pigtails and rosy cheeks, with a purple door crossbody bag so both hands are free for the leash. The dog wears a light turquoise harness cover with soft purple felt spots, and two small fabric horns are sewn to the cover rather than placed on the head. Keep a normal secure harness underneath. Never cover the ears, legs or face. Try it on at home first and take it off if the dog pants hard, freezes or scratches at it.
35. Open-Face Boo Monster Disguise Costume
The open-face disguise gives you the full shape of Boo's purple costume with clear vision. Wear a padded lavender tunic over a gray long-sleeve shirt and leggings, then add soft spotted arms, white felt teeth and a structured hood that frames the face. Eye stalks should bend when touched so nothing snaps in a crowd. Cushioned gray sneakers and two pigtails peeking out near the hood opening finish it. Rosy blush and a big smile are the main makeup. Carry a blue plush or a small door bag. It's detailed enough for a costume contest and still comfortable for a whole party.
Turning a Purple Hoodie Into the Monster Disguise
You don't need a pattern for the disguise. A purple zip hoodie a size or two big is the easiest base, because the zip front makes it quick to get a child in and out.
- Cut a row of white felt triangles and sew them around the inside edge of the hood opening so they point toward the face like teeth. Keep them short enough that they never touch the eyes.
- For eye stalks, stitch two short lengths of foam pipe insulation to the top of the hood and top each with a foam ball and a felt pupil.
- Cut pale felt circles for spots and glue or stitch them across the body and sleeves.
- Stuff two fabric tubes lightly with fiberfill for the extra arms and sew them at the side seams so they swing below the real arms.
Try the hood on the child before the night. If the stalks make it slide backward, a soft elastic under the chin or a couple of snaps to the shirt collar keeps it in place.
A Pink Nightshirt After Dark
Boo's palette is soft, and pastels disappear quickly once the sun goes down. I add reflective tape to the backs of the sneakers and the treat bag, slip a glow bracelet around each pigtail, and hand the child a small flashlight. Leave beaded hair ties at home for toddlers, since a loose bead ends up in a mouth. If you use face paint for the rosy cheeks, test it on the inside of the wrist the day before and remove it at bedtime with a gentle cleanser rather than scrubbing.
Pink Shirt, Purple Leggings, Two Little Pigtails
Boo's pink, purple and white palette adapts to almost any age, body, climate or skill level. A T-shirt dress and pigtails make a last-minute costume, while foam, fleece and felt can build a full monster disguise. A purple door, a blue furry backpack or a plush companion makes the character clear without costing comfort. Choose breathable fabrics, secure shoes and props that leave hands and eyes free. From a toddler's first Halloween to a family monster crew, she's a cheerful character that's easy to wear for a whole evening.
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