The Hair Bow Company has an adorable tutorial for making a DIY mermaid costume! What little girl does not want to be Aerial from the Little Mermaid? The purple mermaid bodice is actually a lined headband that you can purchase from their site, and the bodice is attached to the tail. The mermaid tail is 3 shades of green tulle. You can find the complete tutorial about how to make the criss cross mermaid dress right here.