How do I make a DIY orca fin?

Cut a curved triangle shape out of sturdy cardboard, cover it in black felt or craft foam, and hot-glue two loops of black elastic to the flat side to wear like a backpack.

What is the most comfortable orca costume?

A fleece or flannel hooded onesie is the most comfortable option, offering warmth, easy movement, and a built-in hood and tail.

Can I wear this in warm weather?

If it is warm, skip the heavy fleece onesie and opt for a black t-shirt with a DIY felt belly patch and a lightweight foam fin.

AI-generated example

Orca Costume

Make a splash in a classic black-and-white killer whale look.

The orca, or killer whale, is one of the ocean's most recognizable and majestic marine mammals. People choose this costume for its striking black-and-white color palette, cozy comfort, and playful aquatic vibe. The look typically centers around a plush hooded onesie or a sleek black outfit paired with a custom dorsal fin and white underbelly patches.

Difficulty: Easy
Time: ~30 min
Budget: $20–60

See yourself as Orca →What you need Buy the Orca costume

Try it on

See yourself as Orca

One clear photo of yourself; we render you in this costume — face untouched, full body, about 20 seconds.

Choose or drop a photo of yourselfJPG · PNG · HEIC

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.

Orca costume — Example look · AI-generated

You as Orca

Result

What you need for a Orca costume

Short on time? Buy it ready-made

Spirit Halloween sells the complete Orca costume — one box instead of 5 pieces.

Shop Orca at Spirit ↗

Orca Onesie or Jumpsuit
A plush, hooded black-and-white jumpsuit featuring a dorsal fin on the back and a tail.
DIY: Use a plain black hooded sweatshirt and sweatpants as your base.
Amazon
White Felt Belly Patch
An oval-shaped patch of white fabric to mimic the orca's distinctive underbelly.
DIY: Cut a large oval from a sheet of white felt and attach it to the front of a black hoodie using fabric tape.
Amazon
White Felt Eye Patches
Two elongated oval patches placed just above and behind the eyes.
DIY: Cut two small lens-shaped patches from white felt and fabric-glue them to the sides of your black hood.
Amazon
Dorsal Fin
A stiff, upright black triangular fin worn on the back.
DIY: Cut a fin shape out of cardboard, cover it in black craft foam, and attach black elastic shoulder straps.
Amazon
Black Gloves
Simple black knit gloves to keep your hands warm and match the flippers.
Amazon

Rather not assemble it? See ready-made Orca costumes at Spirit Halloween ↗

How to put it together

1
Put on your base layer of black pants and a black long-sleeve shirt, or step into your plush orca onesie.
2
If DIYing, secure the large white felt oval to the chest and stomach area of your black top using double-sided fabric tape.
3
Attach the two white felt eye patches to the sides of your hood, positioning them just above your temples.
4
Slip your arms through the elastic straps of your DIY cardboard dorsal fin, or ensure your onesie's built-in fin is standing upright.
5
Put on the black gloves to complete the seamless aquatic look.
6
Finish with comfortable black sneakers or boots for walking.

Makeup & hair

Keep makeup simple with black eyeliner or paint a small black-and-white whale graphic on your cheek. Tuck your hair back into the hood of the costume to keep the focus on the whale's face.

Orca for couples, groups, kids & more

couples: Pair up as an Orca and a Marine Biologist, or go as a matching pair of pod-mates.
group: Form a 'pod' of orcas, or create an ocean group theme with sharks, dolphins, and penguins.
kids: A plush zippered orca romper is incredibly warm and adorable for toddlers on chilly nights.
Plus size: A loose-fitting, oversized fleece onesie provides a comfortable, flexible fit for all body types.
pet: A soft-sculpted black-and-white coat with a plush dorsal fin that fastens gently under your dog's belly.

Tips

If using an inflatable orca suit, bring extra batteries for the fan pack to ensure you don't deflate mid-party.
For outdoor trick-or-treating, a fleece onesie is perfect because you can easily layer warm clothes underneath.
Keep the dorsal fin upright by stuffing it with a little polyester fiberfill or crumpled tissue paper if it sags.

Orca costume FAQ

How do I make a DIY orca fin?: Cut a curved triangle shape out of sturdy cardboard, cover it in black felt or craft foam, and hot-glue two loops of black elastic to the flat side to wear like a backpack.
What is the most comfortable orca costume?: A fleece or flannel hooded onesie is the most comfortable option, offering warmth, easy movement, and a built-in hood and tail.
Can I wear this in warm weather?: If it is warm, skip the heavy fleece onesie and opt for a black t-shirt with a DIY felt belly patch and a lightweight foam fin.

Did you know? Orcas are actually the largest members of the oceanic dolphin family, rather than true whales.