The term 'two-piece bathing suit' is often used to refer to a BIKINI, which is a type of swimwear consisting of two separate pieces, typically a top and bottom. The word 'BIKINI' is derived from the BIKINI Atoll, an island in the Marshall Islands, where the first modern two-piece swimsuit was tested in 1946. Bikinis are now a popular choice for beachwear and swimming, and come in a variety of styles and colors.