Backless Sweater

This character wears a backless sweater.

It is a sweater that exposes a lot of the back, from the shoulders to the waist.

A variation called virgin killer sweater in Japan, also exposes the sides of the chest. As the name implies, it is called a virgin killer sweater because it is said to be too stimulating with men with no sexual experience.

Example 1
Example 2
Example 3: Front, Back