Brunette Girl Reveals Her White Pinafore And Hold-ups With Garter Belts Suspenders At The Window On The Sofa Chair

A pinafore /ˈpɪnəfɔər/ (colloquially a pinny in British English) is a sleeveless garment worn as an apron.
Pinafores may be worn by girls as a decorative garment and by both girls and women as a protective apron. A related term is pinafore dress, which is British English for what in American English is known as a jumper dress, i.e. a sleeveless dress intended to be worn over a top or blouse. A key difference between a pinafore and a jumper dress is that the pinafore is open in the back. In informal British usage however, a pinafore dress is sometimes referred to as simply a pinafore, which can lead to confusion.
The name reflects that the pinafore was formerly pinned (pin) to the front (afore) of a dress. The pinafore had no buttons, was simply "pinned on the front" which led to the term "pinafore."