jumper
Edited by AmazingCucumber. Previously edited by AmazingCucumber.
A jumper, pinafore dress or pinafore is a sleeveless, collarless dress intended to be worn over a blouse, shirt or sweater.
Commonly seen on characters such as Kurodani Yamame, Cirno, and Aki Minoriko.
Not to be confused with an apron, which has no back, distinctively.