Question

What is not an official collar shape

Answer 1

The one that is not an official collar shape is: Cinderella

These are several acknowledged official collar shapes:

-Mandarin collar shape, which originated in from Asia. It has a high collar that cover most part of your neck.
-Peter pan collar, which originated from europe. Mostly used for women's clothing.
-Sailor collar, which consists of square shapes covers most part of your shoulder. Mostly used as a uniform.