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Under The Sea Costumes and Accessories

Under The Sea Costumes and Accessories

Under the Sea Costumes

Dive to the deep blue sea with our inspiring Under the Sea Costumes collection! From mermaids to sharks to the mighty Aquaman, you can become any of your favourite sea critters or legends right here at Heaven Costumes.


Whether you're dressing up for Halloween, a themed night out, or going to see your favourite movie and need to dress the night away, our Under the Sea Costumes are the way to go! It’s time for you to explore beneath the waves with our under-the-sea costume ideas for men and women of all ages! [more]

Under the Sea Costume Ideas

Transform yourself into the most gorgeous creature of the sea with our lovely mermaid sea creature costumes! Make your dreams come true with our mermaid costumes and sparkle at your next sea-theme party. Or simply lounge by the poolside and flap your exquisite tail. We can already sea the compliments coming your way. Join Ariel under the sea as the evil sea witch Ursula and rule your next Disney-themed costume party.

Are you ready for a swim? Dress up as a fierce shark with sharp fins and teeth or become your favourite reptile in our crocodile under the seas costumes! Transform into the two best fish of the sea with our adorable Dory and Nemo kids costumes or head down to Bikini Bottom and dress up as Spongebob or Patrick Star. You can even rule the seas at your next party with our Neptune and Poseidon Halloween costumes!

Take a trip into all your favourite Ocean-inspired films and explore the endless costume possibilities at Heaven Costumes. You can even take it a step further. Our Under the Sea Costumes make for the perfect couple and group costumes.

Whether you have a small trio or a large group, you can unite the sea and add your own unique twist on group costumes. Each dress up as your favourite mythological character or sea creature to steal the show at your next party!

Get Noticed in Heaven Costumes

With our wide variety of under-the-sea theme costumes, you can stand out at your Halloween party and make everyone around you swim with laughter! Browse our full collection of under-the-sea costume ideas and find the perfect costume for you. Plus, don’t forget to shop our under-the-sea accessories and props to complete your fabulous look!

If you’re still not sure what you want to be this upcoming Halloween, view our whole selection of creative Halloween costume ideas!

With our truly outstanding, one-of-a-kind Under the Sea Costumes, you can make this Halloween season one to remember!