Jumper (dress)
A jumper (in American English), jumper dress, or pinafore dress is a sleeveless, collarless dress intended to be worn over a blouse, shirt, T-shirt or sweater. Hemlines can be of different lengths and the type of collar and whether there is pleating are also variables in the design.
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.
A jumper is distinct from a sundress, which is typically sleeveless and collarless likewise, but generally of a different cut and fashion and designed to be worn on its own.
The apron dress may be viewed as a special case of the jumper. If the design of the dress is directly inspired by an apron (having a bib in front and ties in the back, for example), the garment is typically described as an apron dress.