Whale Costume
Make a splash in a comfortable, ocean-inspired whale costume.
Whether you want to represent a majestic humpback or a striking killer whale, a whale costume is a fun, ocean-themed choice for Halloween or school plays. This look is incredibly popular for its comfort, often utilizing cozy fleece onesies or simple DIY felt pieces. It is a versatile outfit that works beautifully for toddlers, kids, and adults alike.
- Difficulty
- Easy
- Time
- ~30 min
- Budget
- $20–60
Try it on
See yourself as Whale
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 Whale costume
Short on time? Buy it ready-made
Spirit Halloween sells the complete Whale costume — one box instead of 4 pieces.
Whale onesie or jumpsuit
A soft, oversized fleece jumpsuit in dark blue, gray, or black with a white underbelly panel.
DIY: Use a oversized dark blue hoodie and fabric glue to attach a white felt oval to the chest.
Dorsal fin
A triangular foam or stuffed fabric fin attached to the back of the jumpsuit.
DIY: Cut two large triangles from stiff blue or black felt, sew or glue the edges together, stuff with cotton, and safety-pin to your back.
Whale tail flukes
A fabric tail attached to the back hem of the jumpsuit that drapes down.
DIY: Cut a classic whale fluke shape out of matching felt and attach it to the lower back of your pants or onesie.
Hooded whale face
A hood featuring felt eyes and white felt teeth or baleen lining the rim.
DIY: Glue large white and black felt circles for eyes onto the sides of your hoodie's hood, and line the rim with white felt triangles.
Rather not assemble it? See ready-made Whale costumes at Spirit Halloween ↗
How to put it together
- 1
Put on the base dark blue, gray, or black sweatpants and matching long-sleeve shirt, or slip into a full-body whale onesie.
- 2
If using a DIY hoodie, attach the white felt belly panel to the front chest using fabric glue or safety pins.
- 3
Secure the stuffed dorsal fin to the upper back of your shirt or onesie.
- 4
Attach the whale tail flukes to the lower back hem so they drape behind your legs.
- 5
Pull up the hood and adjust the felt eyes and teeth so they sit visibly on your head.
- 6
Wear matching dark sneakers or slip-on shoes to keep the color palette consistent.
Makeup & hair
Keep makeup minimal with blue or silver face paint accents, or paint a small whale on one cheek. Keep hair tied back or tucked completely inside the hood.
Whale for couples, groups, kids & more
- couples
- Pair up as a whale and an ocean researcher, or go as a whale and a giant squid.
- group
- Create an ocean pod with friends dressed as dolphins, sharks, octopuses, and crabs.
- kids
- A soft, zip-up plush romper with an attached hood is perfect for keeping toddlers warm.
- Plus size
- An oversized fleece onesie offers a relaxed, comfortable, and highly flexible fit.
- pet
- A simple blue dog vest featuring a small stuffed dorsal fin and tail flukes.
Tips
- Choose a zippered onesie if you plan to wear this to outdoor events, as it easily layers over warm clothes.
- If making a DIY tail, use lightweight foam or stuffing so it doesn't drag heavily or pull your pants down.
- For great photos, pose sideways and bend your knees slightly to show off the dorsal fin and tail profile.
Whale costume FAQ
- How do I make a simple DIY whale costume?
- Start with a dark blue or gray hoodie and sweatpants. Glue a large white felt oval to the chest, add felt eyes to the sides of the hood, and pin a cardboard or felt fin to the back.
- What is the most comfortable whale costume?
- A fleece whale onesie is the most comfortable option, offering a loose fit, built-in hood, and easy layering for cold weather.
- Can I turn this into a killer whale (orca) costume?
- Yes! Use a black base instead of blue, add a white belly panel, and place distinctive white felt patches just behind the eyes on the hood.
Did you know? Whales are closely related to hippopotamuses, having shared a common semi-aquatic ancestor about 54 million years ago.