You can whip up 2-3 mermaid costume sets with just 1/2 yard of a four-way stretch dancewear fabric.
This is a great last minute gift you can whip up in an afternoon for the little girl in your life who loves American Girl. This is an easy to make tutorial for a mermaid tail and bandeau style top for your American Girl or similar 18 inch doll. It also fit my 18 inch Waldorf style dolls.
Recommended fabrics: dancewear fabrics, four-way stretch lycra and spandex knits.