Sebastian Costume
Bring the under-the-sea rhythm to life in vibrant red crab style.
Sebastian is the beloved, musically talented Jamaican crab and royal advisor from Disney's The Little Mermaid. People choose this costume for its bright, cheerful energy and nostalgic appeal. The look centers on an all-red ensemble featuring a soft crab shell, claw-like mittens, and a playful crab-eye headpiece.
- Difficulty
- Medium
- Time
- ~45 min
- Budget
- $25–75
Try it on
See yourself as Sebastian
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 Sebastian costume
Short on time? Buy it ready-made
Spirit Halloween sells the complete Sebastian costume — one box instead of 6 pieces.
Red bodysuit or long-sleeve shirt
A solid, bright red long-sleeve crewneck shirt or snug-fitting turtleneck.
DIY: Use any plain red sweatshirt or long-sleeve tee you already own.
Red leggings or pants
Matching bright red fitted pants, leggings, or sweatpants to form the crab legs.
DIY: Use red sweatpants or red jeans.
Plush red crab shell
A padded, segmented red fabric shell worn on the back, mimicking a crab's carapace.
DIY: Cut a large oval from red cardboard or felt, stuff it lightly with batting, and attach elastic shoulder straps.
Red crab claw mittens
Oversized red mittens shaped like pincers that can slide over your hands.
DIY: Cut pincer shapes out of red felt, sew or glue the edges together, leaving the wrist open.
Crab eye headpiece
A red headband featuring two large, upright cartoonish eyes on stalks.
DIY: Glue two white foam balls with painted black pupils onto red pipe cleaners, then wrap them around a red headband.
Red shoe covers or red shoes
Bright red sneakers or fabric shoe covers to complete the monochromatic look.
DIY: Wear solid red socks over your regular shoes indoors, or use bright red sneakers.
Rather not assemble it? See ready-made Sebastian costumes at Spirit Halloween ↗
How to put it together
- 1
Put on the red long-sleeve shirt and matching red leggings or pants.
- 2
Slip on the red shoe covers over your shoes, or put on your red sneakers.
- 3
Secure the plush red crab shell onto your back using the shoulder straps.
- 4
Place the crab eye headband securely on your head, ensuring the eye stalks point upward.
- 5
Put on the red claw mittens, ensuring you can still easily slip your hands out if needed.
Makeup & hair
Keep hair simple or tucked back under a red swim cap. For makeup, apply bright red face paint or red blush on the cheeks to match the vibrant crustacean aesthetic.
Sebastian for couples, groups, kids & more
- couples
- Pair up with Ariel in her classic mermaid tail or blue town dress.
- group
- Form an under-the-sea ensemble with Ariel, Flounder, King Triton, and Ursula.
- kids
- An adorable red fleece onesie with an attached plush hood and soft foam claws.
- Plus size
- Use a comfortable red oversized hoodie and red sweatpants as the base, adding the shell and headband.
- pet
- A lightweight red dog harness featuring a soft felt crab shell and small plush claws.
Tips
- Choose claw mittens that allow your fingers to slip out easily so you can hold drinks or use your phone.
- If wearing this outdoors in cool weather, layer thermal underwear beneath the red shirt and pants.
- Keep the back shell lightweight so it doesn't pull backward or strain your shoulders during the party.
Sebastian costume FAQ
- Is Sebastian a crab or a lobster?
- Sebastian is officially a red crab, specifically described as a Jamaican land crab, despite his lobster-like design in the animation.
- How do I make a quick DIY Sebastian shell?
- Cut a large oval out of red poster board or foam board, paint curved segment lines on it, and staple two loops of red ribbon to wear as backpack straps.
- What is the easiest way to make the claws?
- You can buy cheap red oven mitts or cut pincer shapes out of stiff red craft felt and glue the edges together.
Did you know? In early drafts of The Little Mermaid, Sebastian was envisioned as an English-accented crab named Clarence, but was later changed to a Jamaican Rastafarian character to allow for a Caribbean musical style.