Boo from Monsters, Inc. is one of my favourite costumes to dress, because the whole character comes down to a handful of things most families already own: a roomy pink top, lavender leggings, white socks and two tiny pigtails with bobble ties. Get those right and everyone knows who you are. From there you can go small for a baby, practical for school, or bigger with her purple monster disguise, a bedroom door or a whole monster crew. Below I've gone through thirty ways to do her, with the clothes, hair, props and shoes for each, and what I'd watch out for along the way.
Getting Those Tiny Pigtails to Last Past Bedtime
The pigtails are the single most important part of a Boo costume, and they're also the part that falls apart first. Her bunches sit high on the head and stick out, quite short. On real hair that usually means working against length or fineness.
- Fine toddler hair: part it in the middle and use small fabric-covered elastics, wrapped twice. A tiny spritz of water before you tie it helps the hair grip; skip strong hairspray on very young children.
- Long hair: make the bunch, then fold the tail back on itself and pin it with two crossed bobby pins so only a short tuft shows. That keeps them Boo-sized.
- Very short hair: clip two small pieces of dark faux hair on at the crown, or sew two little bunches to a brown headband or knit hat, as in the baby and winter versions below.
- Bobble ties: the classic plastic ball ties look right, but they can pinch if a child lies back in a car seat or buggy. Fabric pom-pom ties are softer.
Whatever you use, tie them up half an hour before you leave and let your child move around in them. If they're tugging at them at home, they'll pull them out in the first five minutes outside.
1. Classic Boo Halloween Costume
Start with the version everyone remembers. An oversized raspberry-pink T-shirt or short T-shirt dress goes over plain lavender leggings, and the hair goes into two small, slightly uneven pigtails with pink or purple bobble ties. Don't make them neat; Boo's bunches look like a toddler did them, which is the charm. White crew socks are part of the colour story, but I'd add white trainers so nobody walks the street in socks. A small plush monster or a light cardboard door is all the prop you need. It sizes up and down easily for kids, teens and adults.
2. Boo Monster Disguise Costume
The purple monster disguise is the one to make if you like a sewing project. I cut a loose tunic from purple fleece, which is warm, forgiving and doesn't fray, and pad the sides with a layer of quilt batting to get the round shape without any frame. Grey mop strands or strips of grey fleece hung under the hem become the dangling legs. The hood gets big round eyes and soft antennae, set back far enough that the child's face stays fully visible. Lavender leggings, grey slip-ons and mitten-style purple gloves finish it. When the hood comes off, the pigtails underneath still say Boo.
3. Adult Boo Halloween Costume
For grown-ups, I keep the palette and pick a relaxed pink T-shirt dress that hits mid-thigh over opaque lavender leggings. White platform trainers are a nice adult touch. Low mini pigtails with round pink ties work on most hair lengths; if your hair is long, tuck the ends under and pin them so the bunches stay short and Boo-sized. Peach blush, a little mascara and a pink lip tint keep it fresh. Tuck a plush blue monster under one arm and the reference is obvious. A small purple crossbody holds your phone and keys.
4. Toddler Boo Halloween Costume
Toddlers are where Boo really shines, since she is one. I dress them in a roomy pink cotton tunic over soft lavender jersey leggings, and I check every label and seam for scratchiness before the big night, because a toddler will pull off anything that itches within minutes. White crew socks and Velcro trainers they can walk in. Fabric-covered hair ties are gentler than hard bobbles on fine baby hair. A little plush monster doubles as a comfort toy. On a cold night, a long-sleeve thermal under the tunic is invisible and keeps them out longer.
5. Baby Boo Halloween Costume
A baby Boo is mostly about comfort. A pink long-sleeve bodysuit, stretchy lavender footed trousers and a soft pink tunic on top if it's chilly. Non-slip socks or soft crib shoes are plenty. Most babies don't have enough hair for pigtails, so I use a soft brown headband with two little fabric bunches stitched on; it gives the look without pulling anything. No makeup, no glitter and nothing small enough to end up in a mouth. Stitch any decorations on rather than gluing, and keep an eye on the plush or blanket prop when they're sleepy.
6. Plus Size Boo Halloween Costume
For a plus size Boo, I'd start with a relaxed pink swing dress in breathable jersey with roomy sleeves, worn over opaque lavender leggings. Swing shapes hang from the shoulders, so they give you Boo's loose tunic outline without clinging. White crew socks and cushioned trainers for a long night. Two mini pigtails in your own hair, or a dark-brown pigtail wig if your hair is short. A lavender belt bag keeps your essentials in the colour scheme, and a plush monster or cardboard door makes the character clear.
7. Maternity Boo Halloween Costume
A stretchy pink maternity T-shirt dress is an easy base here, layered over lavender maternity leggings with a proper supportive waistband. White socks and slip-on trainers mean no bending to tie laces. Two small pigtails with pink bobbles, rosy blush and a moisturising lip. For a sweet detail, I'd pin a removable felt monster eye to the front of the bump with a couple of safety pins inside the dress, so the fabric isn't damaged. Carry a small plush rather than a big door, and throw a pink cardigan on top if it gets cold.
8. Glam Boo Halloween Costume
The glam version swaps cotton for a bright pink velvet mini over opaque lavender tights. Keep the cut loose; a fitted bodycon dress stops looking like Boo's tunic and just looks like a pink dress. White platforms or low block-heel boots stay walkable. Sleek mini pigtails with glossy pink baubles, lilac shadow and a shiny pink lip push it toward party-ready. A little lavender faux-fur bag and a plush blue monster are your accessories. Velvet shows every crease from a car seat, so steam it once you arrive if you can.
9. Last Minute Boo Halloween Costume
In a hurry? An oversized pink T-shirt over purple or lavender leggings, white socks and white trainers. If your colours aren't exact, go for the closest you have; the pigtails do more for the character than the perfect shade of pink. Two small bunches with bobbles, pom-poms or ribbon over plain elastics. Pink cheeks and that's the makeup done. Draw a quick monster door on paper and pin it to a tote, or grab any blue plush you own. No sewing at all.
10. DIY Boo Halloween Costume
If you like making things, this one costs very little. A long pink thrifted T-shirt or a pink nightshirt cut shorter becomes the tunic, with lavender leggings, white socks and white canvas trainers. Glue small pink and purple pom-poms onto plain hair ties; fabric glue holds better than hot glue on elastic, which flexes and pops the pom-poms off. For the door, flatten a cardboard box, paint it pale lavender and draw simple flowers on it, then add a ribbon handle. Every piece repeats her colours, and that's why it looks intentional.
11. Boo Pajama Costume
Boo spends half the film in what looks like sleepwear, so the pyjama version is very true to her. An oversized pink sleep shirt with lavender pyjama leggings or soft joggers, thick white socks and slippers for an indoor party. Swap to trainers if you'll be outside; slipper soles get soaked on wet pavements in minutes. Relaxed pigtails with a few loose strands, a pink cream blush and lip balm. A blue plush and a small lavender pillow make easy props. I like this one for class movie nights where comfort comes first.
12. Winter Boo Halloween Costume
Cold October nights call for a warmer Boo. Replace the tee with an oversized pink sweatshirt dress and wear fleece-lined lavender leggings underneath, with thick white socks and insulated white high-tops or flat boots. A dark-brown knit hat with two little pigtails sewn to the sides is a clever trick I use for kids who refuse a coat over their costume; it keeps their ears warm and still reads as her hair. A pale purple puffer vest adds warmth without hiding the pink. A plush monster or a door-shaped treat bag finishes it.
13. Boo Tutu Costume
Children who love to twirl get the tutu version: a fitted pink T-shirt with a fluffy lavender tutu over matching leggings. Make sure the shirt and the tutu waistband meet, or a gap of tummy breaks the look. White ankle socks and trainers or ballet flats with secure straps. Bouncy pigtails with pom-pom ties, a little lilac shadow and pink cheeks. Hang a tiny blue plush from a lavender crossbody so little hands stay free. Adults can do it too with a longer tulle skirt.
14. Boo Overalls Costume
Lavender overalls over a pink short-sleeve top give a casual, modern take on her colours. I'd look for cotton or corduroy, and roll the cuffs a little to show off the white socks. White trainers for walking. Two small pigtails with pink and purple ties and natural makeup. The fun detail is the front pocket: stitch or pin on a felt door patch and tuck a miniature plush monster inside, peeking out. Switch to a long-sleeve pink shirt on cooler nights.
15. Boo Hoodie Costume
A pink oversized hoodie is the easiest Boo for kids who live in hoodies anyway. Choose one long enough to hang like a tunic, and wear it over lavender leggings with thick white socks and white trainers. The catch is the hood: pigtails need to sit low so they stay outside it when it's up. Gentle pink blush and a clear gloss are enough makeup. Add removable felt monster eyes to a lavender belt bag and use it for treats. It washes easily, which matters after a night of chocolate.
16. Boo Onesie Costume
For a onesie version, pick a loose pink adult or child-size onesie, with lavender leggings underneath if the legs are short. Non-slip soles indoors, white trainers for trick-or-treating. Pigtails go low again so the hood doesn't squash them. I'd sew a pale purple panel to the front with a few felt eye shapes on it for a subtle monster nod. A plush creature or small door-shaped pillow does the prop job. It's warm, all one piece, and toilet trips are a bit of a project, so plan for that with little ones.
17. Boo And Sulley Couple Costume
Boo and Sulley is the classic pair. One person wears Boo's oversized pink shirt, lavender leggings, white socks, trainers, pigtails and rosy cheeks. The other goes big and blue: a fuzzy turquoise hoodie and joggers, purple felt spots, soft horns and blue trainers. Skip the full mask; blue shadow around the eyes keeps the face friendly and lets them see. Boo carries a cardboard door, and Sulley gets a clipboard. If the party is indoors, faux-fur accents on a fleece base are far cooler than a full furry suit.
18. Boo And Mike Couple Costume
Boo and Mike is lighter and easier to put together. Boo's half is the usual pink tunic, lavender leggings, white socks, trainers and pigtails. Mike is a bright green sweatshirt and trousers with one big felt eye on the chest; cut the eye from white felt with a blue and black felt iris layered on top, and stitch it, since iron-on adhesive often lets go on fleece. A green beanie with two soft horns and green or white trainers finish him. It's great for a parent and child or two siblings.
19. Boo Sulley And Mike Group Costume
Add a third person and you've got the trio. Boo in her long pink tee, lavender leggings, white trainers and pigtails. A turquoise hoodie and joggers with purple spots and soft horns for the big blue monster. A green sweatsuit with a large felt eye and little horns for the small green one. Give each person one prop: the door for Boo, a spotted tote for Sulley, a clipboard for Mike. Leave out bulky masks so everyone can see, talk and eat. The strong colour contrast is what makes three people read as one group.
20. Boo Family Halloween Costume
For a whole family, the youngest is nearly always Boo. One adult takes the blue spotted monster, another the green one-eyed sweatshirt, and any other children become colourful monster workers in hoodies, joggers and soft fabric horns. Keep face paint to the eyes or cheeks in each person's colour rather than full coverage; it's quicker, and nobody gets a sweaty painted face. Carry light cardboard doors in different pastels to tie the group together. A buggy can become a door station with paper panels taped to the sides.
21. Boo And Randall Duo Costume
Boo and Randall gives you more contrast than two cuddly monsters. Boo is in her pink T-shirt dress, leggings, white socks, trainers and pigtails. Randall is a purple hoodie and joggers with lighter blue felt scales stitched on, a softly stuffed fabric tail, a purple beanie and violet trainers. Lavender shadow and purple face accents suggest the lizard without hiding the face. The tail is where I'm careful: keep it short enough to stay off the floor and attach it to a belt rather than the joggers, so it doesn't drag them down.
22. Boo And Celia Duo Costume
Boo and Celia is the best-friend version. One person wears Boo's pink tunic, lavender leggings, white trainers and pigtails. The other is Celia: a fitted purple top, a metallic teal midi skirt or wide-leg trousers, purple tights and low lavender boots. Her snake hair is the fun bit, and soft fabric tubes stuffed with fibrefill and sewn to a headband stay light enough to wear all evening. Shimmery lavender shadow and green liner give the glam. Boo gets a plush, Celia a purple handbag with a felt eye.
23. Boo And Roz Duo Costume
Boo and Roz is the funny one, and it's lovely for teachers or coworkers. Boo is the oversized pink tee, lavender leggings, white socks and pigtails. Roz is a mustard cardigan over a brown midi dress, a burgundy scarf and low brown loafers, with a grey-lilac wig set in a neat roll and cat-eye glasses on a beaded chain. A touch of muted purple shadow is all the monster she needs. Boo carries her door; Roz carries a clipboard and a stack of pretend paperwork, and an unimpressed expression.
24. Boo And Door Costume
The door duo puts Boo's bedroom door on a person. Boo wears her pink tunic, leggings, white socks, trainers and pigtails. The door is two lightweight foam-board panels joined at the shoulders with fabric straps, painted lavender with white flowers and a gold cardboard doorknob. I always measure the panels against the narrowest doorway they'll pass through; foam board catches on frames and crowds more than you'd expect. A lavender long-sleeve top, black leggings and matching trainers underneath help the door look solid.
25. Boo And Sock Couple Costume
In the film, a single child's sock stuck to a monster's back sets off a full panic, which makes this pairing a nice deep cut. Boo wears her pink T-shirt dress, lavender leggings, white socks, trainers and pigtails. The second person is a big striped sock: a long white tunic with red bands, white leggings, red trainers and a white beanie with a red pom-pom. Red felt strips stitched on, or fabric paint over masking-tape lines, make the stripes. Add a small sign with a sock drawing in case anyone needs the hint.
26. Boo Closet Costume
The closet costume is the most ambitious here. Over Boo's pink tee, lavender leggings and pigtails, you wear a light frame made from narrow foam-board strips on backpack straps, covered in lavender paper and several mini pastel doors. Little plush monster faces peeking from behind a door or two make it. Keep the frame above the knees and clear of the arms, or the child can't hold a treat bag. Test it at home first, and leave it at home if it's windy; a frame like this acts as a sail.
27. Boo Rainy Weather Costume
Rain is common on Halloween, so it's worth planning a wet-weather Boo. A waterproof pink raincoat over a lavender thermal top and leggings keeps the colours showing, with white or pale purple wellies and thick socks. Low pigtails sit under a clear hood with bright ties you can still see. Cardboard props turn to mush in the rain, so I'd decorate a lavender umbrella with removable felt monster eyes instead. A plush rides dry in a clear backpack. A strip of reflective tape on the coat and boots helps drivers see small people on dark streets.
28. Boo School Halloween Costume
For school, I keep Boo comfortable at a desk and safe on a playground. A long pink tee or a knee-length cotton tunic over lavender leggings, white crew socks and supportive trainers. Neat mini pigtails with covered elastics; big bobbles can dig in when a child leans back in a chair. Natural face or a little washable blush. Decorate the school bag with removable felt doors and clip on a small plush monster keyring. A pink zip-up handles a cold classroom. Check your school's costume rules first; nothing here trails, blocks vision or looks like a weapon, so it usually passes.
29. Boo Work Halloween Costume
At the office, I'd translate Boo into separates: a raspberry-pink tunic blouse with tailored lavender ankle trousers and white leather trainers or pale loafers. Two low ponytails with small pink ties are subtle enough for a meeting; clip them back if pigtails feel too young. Understated makeup, a rose lip tint. A lavender tote with one door-shaped charm and a small plush monster on the desk say the rest. It keeps her palette and loses the sleepwear, which is what most dress codes need.
30. Boo And Pet Halloween Costume
For you and your pet, you're Boo in the pink tunic, lavender leggings, white trainers and pigtails, and the pet becomes the friendly blue monster in a light turquoise harness or soft pet shirt with purple felt spots. A small hood with soft horns only goes on if your animal is happy with it; take it off at the first sign of stress, like tail tucking or freezing. No human makeup or hair colour on pets, ever. A door-shaped tag on the collar is a sweet finishing detail, and a pink pouch can hold treats, water and bags.
Fleece, Felt and Faux Fur for the Monster Half
Many of these costumes pair Boo with a monster, and the monster fabric decides whether that person is comfortable all evening. I make most of them from fleece. It doesn't fray, so you can cut spots, scales and eyes and skip hemming; it's warm outdoors; and it's easy to stitch by hand.
- Faux fur looks great on Sulley but sheds like mad when you cut it. Cut from the back with small snips through the backing only, then shake the pieces outside before you sew.
- Long-pile fur gets hot fast. For an indoor party, I'd put fur only on the shoulders and hood, with a fleece body underneath.
- Felt spots and eyes hold better stitched than glued. Hot glue goes brittle in cold air and pops off when the fabric flexes; a quick running stitch around each shape lasts for years.
- Soft horns stuffed with fibrefill are safer than foam or card ones when kids are bumping into each other.
Matching Her Pink and Purple Off the Rack
Finding the right pink and lavender in shops can be surprisingly hard, because pinks lean toward peach or toward cool fuchsia. Boo's top is a warm raspberry pink and her leggings are a soft lavender, so take the leggings with you when you shop for the top, or the other way round, and check them together in daylight. If you can't find the right leggings, white cotton ones dyed with purple fabric dye in a bucket give you a decent lavender in an afternoon. Kids' sections usually have more pinks and lilacs than adult sections, and many adult sizes still fit an oversized kids' top.
Pink Top, Lavender Leggings, Two Little Pigtails
Boo is one of the most forgiving characters to dress. A pink tunic, lavender bottoms, white shoes, two small pigtails and rosy cheeks are the base, and a monster friend or a door turns it into something bigger. That same formula bends to fit babies, adults, couples, whole families, cold or wet weather, school, the office and even a pet. Use light materials, stitch down anything a child could pull off, and test any big prop at home before it goes out. Keep it playful, and remember that the kid inside it needs to be able to run up to doors.
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