How do I make a DIY sea turtle shell?

Cut a large oval out of cardboard, paint it with green and brown hexagonal patterns, and hot glue two elastic loops to the back to wear as backpack straps.

What is the easiest way to make this costume last-minute?

Wear a green hoodie and sweatpants, draw a shell pattern on a brown paper bag or cardboard piece, and pin it to your back.

Is this costume comfortable for walking around?

Yes, because it relies on soft jumpsuits and a lightweight backpack shell, making it highly mobile, warm, and practical for parties or trick-or-treating.

AI-generated example

Sea Turtle Costume

Make a splash this Halloween in a cozy, ocean-inspired look.

The sea turtle is a beloved marine reptile chosen by costume lovers for its cute, laid-back vibe and comfortable design. This look typically consists of a green hooded jumpsuit, a detailed turtle shell backpack, and flipper-style sleeves. It is a fantastic, family-friendly choice that works beautifully for all ages and body types.

Difficulty: Easy
Time: ~20 min
Budget: $25–75

See yourself as Sea Turtle →What you need Buy the Sea Turtle costume

Try it on

See yourself as Sea Turtle

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.

Sea Turtle costume — Example look · AI-generated

You as Sea Turtle

Result

What you need for a Sea Turtle costume

Short on time? Buy it ready-made

Spirit Halloween sells the complete Sea Turtle costume — one box instead of 4 pieces.

Shop Sea Turtle at Spirit ↗

Green hooded jumpsuit
A soft, zippered emerald or olive green fleece jumpsuit with a hood.
DIY: Use a matching green hoodie and green sweatpants.
Amazon
Turtle shell backpack
A lightweight, plush or molded plastic turtle shell with adjustable shoulder straps.
DIY: Cut a large oval out of cardboard, paint hexagonal green and brown scute patterns on it, and attach two elastic shoulder straps.
Amazon
Plastron chest patch
A light yellow or tan oval felt patch representing the turtle's underbelly.
DIY: Cut an oval out of a yellow felt sheet or an old t-shirt and safety pin it to the front of your jumpsuit.
Amazon
Flipper hand covers
Green felt or fabric covers shaped like wide marine flippers.
DIY: Trace a flipper shape onto green felt, cut out two matching pieces for each hand, and sew or glue the edges together leaving a wrist opening.
Amazon

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

How to put it together

1
Put on the green hooded jumpsuit or your matching green sweatpants and sweatshirt.
2
Attach the light yellow felt oval patch to the front torso of your jumpsuit using fabric glue or safety pins to create the underbelly.
3
Slip your arms through the straps of the turtle shell backpack, adjusting them so the shell sits flat against your back.
4
Put on the flipper-shaped hand covers or green gloves over your hands.
5
Pull up the hood of the jumpsuit to complete the rounded turtle head silhouette.

Makeup & hair

Keep your hair tucked neatly inside the hood. For a fun touch, apply light green face paint or green eyeshadow around the eyes to match the marine theme.

Sea Turtle for couples, groups, kids & more

couples: Pair up with a scuba diver, a shark, or a colorful jellyfish for an under-the-sea duo.
group: Gather a group to represent different marine animals, or have everyone dress as different sea turtle species.
kids: A plush, zippered one-piece hooded jumpsuit is incredibly cute, warm, and easy for toddlers to wear.
Plus size: An oversized green fleece jumpsuit offers maximum comfort, warmth, and a great rounded silhouette.
pet: Use a lightweight, strap-on plush turtle shell that secures comfortably around your dog's chest.

Tips

Choose a hollow shell backpack with zipper storage so you can carry your keys, phone, and wallet inside your costume.
If wearing this outdoors in cold weather, layer thermal underwear beneath the jumpsuit to stay warm.
For photos, extend your arms horizontally and tilt your hands down to mimic a swimming motion.

Sea Turtle costume FAQ

How do I make a DIY sea turtle shell?: Cut a large oval out of cardboard, paint it with green and brown hexagonal patterns, and hot glue two elastic loops to the back to wear as backpack straps.
What is the easiest way to make this costume last-minute?: Wear a green hoodie and sweatpants, draw a shell pattern on a brown paper bag or cardboard piece, and pin it to your back.
Is this costume comfortable for walking around?: Yes, because it relies on soft jumpsuits and a lightweight backpack shell, making it highly mobile, warm, and practical for parties or trick-or-treating.

Did you know? Sea turtles have been swimming in Earth's oceans for over 100 million years, meaning they coexisted with dinosaurs.