Crochet Mermaid Cocoon. Plus they look the cutest. See the Crochet Mermaid Tail pattern here.
Ill give you a little bit of my thought process. Ch 3 at beginning of rounds counts as dc. If you want one for yourself try making bigger version.
Mermaid Tail Cocoon Crochet SKU.
Set of 3 Mermaid Patterns by Crochet by Jennifer. The tail is sewn onto the cocoon with crocheting ruffles using basic stitches like a slip hdc sc and dc. The body the fin and the ruffles. 5 out of 5 stars 844 569.