Sans Costume
Bring Undertale's favorite laid-back skeleton to life with this easy cosplay.
Sans from Undertale is a beloved, easygoing skeleton known for his puns and surprisingly challenging boss fight. This costume is a massive hit at conventions and Halloween due to its casual comfort and instant recognizability. The signature look features a bright blue hoodie, black athletic shorts, and a pair of pink bedroom slippers.
- Difficulty
- Easy
- Time
- ~20 min
- Budget
- $30–75
Try it on
See yourself as Sans
One clear photo of yourself; we render you in this costume — face untouched, full body, about 20 seconds.
One render, $1. No account needed — if it fails you're not charged. Pricing.
Your photo is sent to Google's Gemini API to make the render and isn't used for training. Renders are AI-generated and labelled.
Want a different costume on this photo, or a whole group in costume? Open the Try-On Studio.
What you need for a Sans costume
Short on time? Buy it ready-made
Spirit Halloween sells the complete Sans costume — one box instead of 6 pieces.
Blue zip-up hoodie
A bright royal blue zip-up hoodie, worn open or halfway unzipped.
DIY: Use any plain blue hoodie you already own.
White t-shirt
A plain white crewneck t-shirt to wear underneath the hoodie.
Black athletic shorts
Black mesh or cotton athletic shorts, ideally featuring a white stripe down each side.
DIY: Take plain black shorts and fabric paint or tape a white stripe down each side.
Black leggings
Snug black leggings or tights worn under the shorts to represent skeleton legs.
Pink plush slippers
Fluffy, slip-on pink house slippers.
Skeleton mask
A white, rounded skull mask with black mesh over the eyes and a wide toothy grin.
DIY: Use white and black face paint to draw a cartoonish skull face with a wide grin.
Rather not assemble it? See ready-made Sans costumes at Spirit Halloween ↗
How to put it together
- 1
Put on the plain white crewneck t-shirt.
- 2
Pull on the black leggings or tights to cover your legs.
- 3
Wear the black athletic shorts with white side stripes over the leggings.
- 4
Put on the bright blue zip-up hoodie, leaving it unzipped or only partially zipped.
- 5
Slip your feet into the pink plush house slippers.
- 6
Put on the skeleton mask, or apply your skull face paint.
- 7
Optionally, add a small blue LED light inside the left eye socket of the mask to mimic his glowing eye.
Makeup & hair
If you are not using a mask, paint your entire face and neck white. Use black face paint to create large, circular eye sockets and a wide, toothy, unmoving grin. Add a splash of bright blue face paint or cosmetic glitter around your left eye to represent his glowing eye.
Sans for couples, groups, kids & more
- couples
- Pair up with someone dressed as Sans's tall, energetic brother, Papyrus.
- group
- Form an Undertale group with Papyrus, Toriel, Frisk, and Chara.
- kids
- An excellent, comfortable choice for kids using everyday cozy clothing.
- Plus size
- The oversized hoodie and elastic-waist athletic shorts make this an incredibly comfortable, size-inclusive option.
- pet
- Dress a small dog in a tiny blue hoodie and a white felt collar.
Tips
- Keep the hoodie unzipped to show off the white t-shirt underneath, just like Sans does in the game.
- If wearing this costume outdoors or to a convention, choose pink slippers with thick rubber soles for durability and safety.
- Practice your best skeleton puns and a relaxed, hands-in-pockets slouch to fully embody the character.
Sans costume FAQ
- What color are Sans's slippers?
- While his sprite colors can vary, official merchandise and fan consensus establish that Sans wears light pink plush house slippers.
- How do I make Sans's eye glow?
- You can secure a small, lightweight blue LED light inside your mask's left eye socket, or use bright blue UV-reactive face paint.
- Is a Sans costume comfortable for long events?
- Yes, it is one of the most comfortable cosplays available, consisting entirely of a soft hoodie, shorts, leggings, and slippers.
Did you know? Sans is named after the Comic Sans font, which is used for almost all of his dialogue text boxes in Undertale.