Final answer:
Rudi Gernreich, the Austrian designer, is known for creating the monokini, a one-piece bathing suit that challenged 1960s fashion and social norms.
Step-by-step explanation:
The Austrian designer known for creating the monokini is Rudi Gernreich. The monokini was a revolutionary design that featured a one-piece swimsuit that exposed the breasts, making a bold fashion statement during the 1960s. Gernreich was an advocate for social progress and body positivity, and his creation of the monokini was also a political statement, challenging conservative norms and pushing the boundaries of fashion and social mores of the time.