Jumper (dress)
（重定向自Apron dress）
A jumper (in American English), pinafore dress or informally pinafore (British English) is a sleeveless, collarless dress intended to be worn over a blouse, shirt or sweater. In British English, the term jumper describes what is called a sweater in American English. Also, in more formal British usage, a distinction is made between a pinafore dress and a pinafore. The latter, though a related garment, has an open back and is worn as an apron. In American English, pinafore always refers to an apron.