Vest: It's probably a sleeveless dress as shown in the picture.

Underwear: refers to the clothes worn, including vests, undershirts, shorts, tube tops, bras, etc. , usually in direct contact with the skin, is one of the indispensable clothes for modern people.

Underwear has the functions of absorbing sweat, shaping, setting off the figure, keeping warm, and not being harmed by pollution from the body, and is sometimes regarded as a sexual feature.