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Young girl wearing diy jellyfish costume

DIY Under-the-Sea Costumes: Jellyfish!

By Brenda Ponnay

I know the jellyfish-made-from-an-umbrella costume has been done many times but I can’t very well create an under-the-sea costume series without including this magnificent NO-SEW wonder! I know, those tendrils look like some kind of fancy ruffling but they’re not. Simple, simple, simple! Everyone should rush out and get a clear umbrella right now and make this adorable Jellyfish costume.

Visual tutorial for making jellyfish costume

Supplies for our Jellyfish Costume for kids

1. a clear umbrella (actually any color would work but we think clear is extra fancy and pretty)
2. Five or six 6-inch squares of fabric. Any kind will do. I bought some $1.98 fluorescent t-shirts and used them for fabric. Much cheaper and I didn’t have to stand in the cutting line at the fabric store (and you know what that can be like this time of year)!
3. Any other kind of notions you think will look pretty hanging from an umbrella and be tendril like. We used a string of tiny pom poms and some sequined thread but ribbons would work, even crepe paper steamers would work.
4. Something to attach the tendrils to the umbrella like quick-drying glue or even clear tape (note: hot glue does NOT work. It will melt your plastic umbrella and there goes all the fun).
5. fabric scissors

How to Make a Jellyfish Costume

The first step is the trick. Take your six-inch square of fabric and round the edges so that it’s a circle. Then cut a spiral into the circle to the very center. When you unwrap the spiral it will hand down in a tight spiral (see photo above). It’s magic! Once you have all your tendrils cut, attach them to your umbrella with glue or tape.

Add a cute coordinating outfit and you are ready to twirl! And just think, if it rains on Halloween night, you’re ready!

DIY Under-the-Sea Costumes: Jellyfish! by Brenda Ponnay for

Difficulty Level: easy!

Crafting time: 1/2 hour to an hour, depending on how coordinated you are with fabric scissors

Check Out Some Other Costumes in our DIY Under-the-Sea Series:



About the Author

Brenda Ponnay

Brenda Ponnay is an author and illustrator who loves to craft and make big messes when she’s not working on her books. Whether it’s painting, baking, drawing, making castles out of card...

Brenda Ponnay is an author and illustrator who loves to craft and make big messes when she’s not working on her books. Whether it’s painting, baking, drawing, making castles out of cardboard boxes or just doing the laundry with flair, Brenda Ponnay has learned that what really makes her happy is being creative every single day.

You can read about all her crazy adventures on her personal blog: Secret Agent Josephine.

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Hi Brenda, just wanted to say what fabulous ideas you have for non-sewers like me on your Under the Sea pages which were the source of inspiration for our children’s Under the Sea Summer School Carnival Theme. My daughter was a jellyfish and my son was a starfish and they loved the creations. We adapted them slightly. They both enjoyed decorating their creatures too. The hard work paid off because they both won their group fancy dress competition! I would love to share a photo, thank you for providing the inspiration, Georgina, England

Isabel Kallman

Thanks for the awesome feedback. Really appreciate you taking the time to write to us and sharing such nice words. It means a lot! Isabel (founder of Alpha Mom)


[…] And here’s one from Alpha Mom that uses an umbrella: […]


[…] For more detailed instructions click here […]


[…] be thrown away, be creative with what you own. Become a scuba diver with some old snorkel gear,  a jellyfish, or do a costume swap with a […]