Monokini
The monokini (also known as a "topless bikini" or "unikini") was designed by Rudi Gernreich in 1964, consisting of only a brief, close-fitting bottom and two thin straps; it was the first women's topless swimsuit. His revolutionary and controversial design included a bottom that "extended from the midriff to the upper thigh" and was "held up by shoestring laces that make a halter around the neck." Some credit Gernreich's design with initiating, or describe it as a symbol of, the sexual revolution.