Jumpsuit

Jumpsuit is a piece of clothing, originally referred to the functional one-piece garments used by parachuters/skydivers. More recently, it has come to be used as a common term for any one-piece garment with sleeves and legs and typically, though not always, without integral coverings for feet, hands or head.

The original skydivers' jumpsuits were simple garments designed to insulate the body from the cold of high altitudes and minimize 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 launder, put on and remove than an ensemble outfit. Unless the jumpsuit has a drop seat, however, it is necessary to remove it entirely for bathroom use.

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.

Drivers in motor racing wear jumpsuits for protection against fire and (in the case of motorcycle racers) leather suits for abrasion.

Skiers wear insulated jumpsuits or ski suits to protect themselves from cold (especially after falling or tumbling in snow).

Competitive skiers and speed skaters wear skin-tight jumpsuits to provide freedom of movement while minimising air resistance.

Skydivers wear technical jumpsuits as main sport equipment for today's sport skydiving.

The jumpsuit's simple one-piece design also makes it a practical garment for tradesmen, such as cleaners, auto mechanics and plumbers, who often wear looser-fitting jumpsuits, or coveralls, where they need a better-protecting garment than an apron or bib.

...
Wikipedia