On 5 July 1946, 18-year-old Micheline Bernardini, a nude dancer at the Casino de Paris, showcased the “Bikini”, the first two-piece swimming costume, at the Piscine Molitor, a popular venue for Parisian bohemians. The creator of the swimming costume is believed to have been French fashion designer Louis Réard, who perfected Jacques Heim’s design.
The minimalist “Atome” swimming costume by Jacques Heim was gaining popularity at the time. Louis Réard, “having torn” the design in two, first named it “Split Atome” and, after the news of a nuclear test on a Pacific island called Bikini Atoll, renamed the new model the “Bikini”.
Despite the sexual revolution and the unprecedented liberalisation of attitudes after the Second World War, it took a few more years before the swimming suit came into use and it was not until the mid-Fifties before it had ceased to shock the general public, with the first sample not yet having adopted the classic “four triangles; six braces” shape. In the USSR as late as 1968, a bikini featured in Leonid Gaidai's comedy “The Diamond Arm” and was considered an erotic scene. It was almost removed from the film by the censors.
Source: Megan Gibson, “Top 10 Bikinis in Pop Culture”, Time, from 7 July 2011.