A gilet (/dʒɪˈleɪ/) or body warmer is a sleeveless jacket resembling a waistcoat or blouse.

Gilets can be waist- to knee-length and are typically straight-sided rather than fitted, but historically, they were fitted and embroidered.

In 19th-century dressmaking, a gilet was a dress bodice shaped like a man's waistcoat.

Gilets are often worn as an outer layer, for extra warmth outdoors, or indoors on occasion.

Fashion gilets can be made of cloth, fake fur, or knitted wool.

Sports gilets are often windproof and made of fleece or a similar synthetic material.

High-end hiking jackets often have an integral gilet inside them, which can be zipped on and off, as well as insulated with down.

Racing cyclists use thin light gilets with a windproof front and mesh back. Shooting gilets are rugged and made of leather.