A pinafore /ˈpɪnəfɔːr/ (colloquially a pinny /ˈpɪni/ 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 (known as a jumper in American English), 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. Nevertheless, this has led some authors to use the term "pinafore apron", although this is redundant as pinafore alone implies an apron.
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."
Pinafores are often confused with smocks. Some languages do not differentiate between these different garments. The pinafore differs from a smock in that it does not have sleeves and there is no back to the bodice. Smocks have both sleeves and a full bodice, both front and back.
A pinafore is a full apron with two holes for the arms that is tied or buttoned in the back, usually just below the neck. Pinafores have complete front shaped over shoulder while aprons usually have no bib, or only a smaller one. A child's garment to wear at school or for play would be a pinafore. More recently, other types of full or dress-like aprons are also occasionally referred to as pinafores. In particular, this is the case for an apron with a full skirt, bib and criss-cross shoulder straps.