A jumpsuit is one piece of clothing that covers the body from the shoulders down the legs, like a shirt and trousers made as one. The first ones were for people who jumped from planes with a parachute, so the top would not fly up. That is still a jumpsuit. Later the same idea became work clothes, and in some countries prison clothes, often orange. Then it became fashion, especially for women: a smart one-piece you wear instead of a dress or a separate top and trousers. Though actually, some people say jumpsuit only for the fashion piece, and call the heavy work one a boiler suit or coveralls. In everyday talk the fashion meaning is now very common. It is not a business suit; that kind of suit is a jacket and trousers in two pieces.