Men's Underwear

Undergarments commonly worn by women today include brassieres and panties (also known as knickers), while men often wear briefs, boxer shorts, and boxer briefs. Items commonly worn by both sexes include T-shirts, sleeveless shirts (also called singlets), bikini underwear, thongs, and G-strings.
Terminology
There are several other terms for undergarments. Underclothes, underclothing and underwear are formal terms, while undergarments may be more casually called, in Australia, Reg Grundys (rhyming slang for undies) and Reginalds, and, in the United Kingdom, smalls (from the earlier smallclothes).