Bikini
From wipipedia.org
A bikini is a two-piece swimsuit for women.
The top part is like a bra and the bottom part is a pair of briefs, which may resemble hotpants, a tanga or a thong. The term bikini bottom or bikini briefs is sometimes used for very tight brief shorts.
Etymology
Bikini is a Pacific atoll where an atom bomb was exploded in 1946. A bikini is supposed to have the same explosive effect on a male viewer. Bi- is nothing to do with the prefix bi- meaning two; however, as a pun the word monokini has been used to mean a swimsuit consisting only of the bikini bottom and leaving the breasts uncovered.