DIY Mermaid Crew Costume: Easy 20-Min Build

DIY mermaid crew costume built from t-shirt or dress in a sea color, face paint in a matching accent color, and plastic trident prop

AI-generated concept photo

Pictured: the sea king, the mermaid, and the crab.

Time20 minEffortEasy

⏱️ We timed it, but results may vary.

Plan this costume →No signup · 2 minutes.

The mermaid, the prince, the sea king, the sea witch, or the crab. Pick your role, the crew needs all five. Twenty minutes, easy: a t-shirt or dress in a sea color, matching face paint, and a plastic trident prop. The sea witch should get the best makeup; villains earn it.

2 of 6 things covered, counting basics we assume you have.

Tap a supply to tick what you own.

Still need:

T-shirtRed face paint / lipstickPlastic trident propShell necklace

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Tip: dab the accent face paint along the cheekbones through a fishnet stocking as a stencil.

Materials

T-shirt or dress in a sea color (teal, purple, red, white), 1 per person (buy: thrift store, or own)
Face paint in a matching accent color, 1 tube (buy: drugstore)
Plastic trident prop, 1 (buy: toy store)
Toy crab or red paper for a cardboard crab, 1 (make: cut from red paper, or buy: toy store)
Shell necklace, 1 (buy: craft store, or make: string pasta shells)
Scissors and tape, 1 set (own)

Steps

Sketch the cheek detail on paper first.
Paint one small matching detail per person: scales, a seaweed swirl, or an anchor.
Cut a red paper body, legs, and claws.
Tape them to the smallest person's shirt.
Or hand them the toy crab instead.
The sea king carries the plastic trident prop.
Everyone else picks one accessory, like the shell necklace.
Stand tall for the crew photo.
Optional pro finish: dab the accent face paint along the cheekbones through a fishnet stocking as a stencil.

Start this costume in the planner

Common questions

What if we cannot find sea-colored shirts?

Any solid tee works with the accessories doing the work. The trident plus the shell necklace plus one painted detail reads as mermaid crew on any color.

How do you keep the crab on the shirt?

Tape it from inside the shirt with a big tape loop, or pin it. Do not tape it to bare skin; sweat loosens tape in an hour.