Rudi Gernreich was an Austrian-born American fashion designer who is best known for his avant-garde designs in the 1960s. He was a pioneer of unisex clothing and the topless swimsuit, and his designs were often seen as radical and ahead of their time. He was also a leader in the use of synthetic fabrics, such as spandex, and he was one of the first designers to embrace minimalism. His designs were often featured in Vogue magazine, and he was a major influence on the fashion industry.