Gilet

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

[3] Today, gilets are often worn as an outer layer, for extra warmth outdoors, or indoors on occasion.

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

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

Racing cyclists use thin light gilets with a windproof front and mesh back.