When I saw this Sushi Baby Costume on Martha Stewart's website, which was made by Carolynn Caffelle I could not resist making one for my niece/nephew-to be for Christmas a couple years ago.
There are templates to make either tuna or shrimp (<-- the one I chose).
It was a lot of fun to make, and got quite a few smiles when it was done :)
My brother & sister-in-law took some adorable pictures of my niece wearing this, where they had chopsticks in the forefront of the picture and it looked like they were "picking up the sushi" hahaha.