Ideas for Underwater Theme Dress Ups

Updated March 23, 2017

Dressing up, whether for Halloween or for a theme party, can be more interesting if there is a theme. An underwater theme provides an array of costume ideas ranging from sea animals to ocean scenery motifs, giving you a wealth of costumes to choose from for your next underwater theme party.


A mermaid is a mythological character associated with the sea. Whether you rent a costume, purchase one or make it yourself, a mermaid is the ideal costume for an underwater theme costume event. As a mermaid, you can be anything from Ariel in the "Little Mermaid" to your own version of a mermaid.

Starfish and Seashells

A starfish or a seashell is a costume idea you can put together yourself. Cut the costume out of cardboard or use foam rubber to make it. Paint your finished costume in bright coral colours that will fit well at any underwater-themed event.

SpongeBob SquarePants

An underwater theme party for kids might consist of costumes based on SpongeBob and his friend. These costumes can be homemade or purchased from a costume store. SpongeBob characters include Patrick Star, Squidward Tentacles and Mr. Krab.


Go to your next underwater party event as a giant octopus. You can purchase an octopus costume from a Halloween costume store. As an alternate, go as a squid or a stingray. These underwater beasts make ideal costumes for a sea party


While pirates don't live in the sea, they certainly spend a great deal of time on the sea, making a pirate costume ideal for any ocean themed party. Whether you go as a famous pirate, such as Captain Hook or Captain Jack Sparrow, or make up your own pirate costume, you'll be representing an iconic image of the sea.

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About the Author

Carl Hose is the author of the anthology "Dead Horizon" and the the zombie novella "Dead Rising." His work has appeared in "Cold Storage," "Butcher Knives and Body Counts," "Writer's Journal," and "Lighthouse Digest.". He is editor of the "Dark Light" anthology to benefit Ronald McDonald House Charities.