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A jumpsuit is a one-piece garment with sleeves and legs and typically without integral coverings for feet, hands or head. The original jump suit is the functional one-piece garment used by parachuters.
The original skydivers' jumpsuits were simple garments designed to insulate the body from the colder temperature that's associated with higher altitudes and minimize the risk of covering important handles and grips. Today, however, the garment has found other uses.
Jumpsuits are generally regarded as a garment of convenience, as they are simpler to wear. They are more of a put on and remove garment than an ensemble outfit. Unless the jumpsuit has a drop seat, however, it is necessary to remove it entirely for bathroom use.
Pilots and drivers
Aviators and astronauts sometimes wear insulated, fire-retardant jumpsuits or flight suits where other types of clothing can potentially float or flap about in zero gravity or during high-G maneuvers.
In prisons, prisoners are required to wear prison jumpsuits to make it somewhat harder for escape (surgical scrubs), not only by making it harder for flexible maneuvers in the case of surgical scrubs, but they also in most cases make the prisoner easier to spot and more distinct.