Mermaid Tail Blanket

Besides the baby blanket, I mentioned I was also making a mermaid tail, and I was asked what a mermaid tail was (is). A mermaid tail is a blanket shaped like a cocoon or a pouch. You slip your legs in to keep you toasty. There's a decorative, tail fin sewn to the bottom of the cocoon.

The front of the blanket. The shell pattern and variegated colors of yellow, white, blue, green, aqua and yellow are supposed to resemble fish scales.

The back of the blanket is opened to make getting into the cocoon easy. The bottom of the cocoon is sewed from the feet up to the ankles or mid-calf.

I've picked turquoise to crochet the tail. I thought continuing with the variegated yarn would make the blanket too busy. I'm having some difficulty with the tail. I can't seem to get the triangle shape right.

This is what the blanket is supposed to look like with the tail attached. The pattern comes from YarnUtopia. Fortunately, the author also included a video tutorial so hopefully, I'll be able to follow along to crochet the tail.