Just in case we ever need a fish. . this is soo cute and completely doable!
No-Sew Jellyfish Costume by Brenda Ponnay
under the sea costume ideas - Google Search
Under the Sea Easy Costumes | DIY Under-The-Sea Kids’ Costumes for Halloween: Round up!
We have a whole series of kids' Under-the-Sea themed costumes for Halloween. Fun and super easy to make.
21 Cute And Clever DIY Halloween Costume Ideas For Kids