The modern bikini was introduced by French engineer Louis Réard and fashion designer Jacques Heim in Paris in 1946. Réard was a car engineer but by 1946 he was running his mother's lingerie boutique near Les Folies Bergères in Paris. Heim was working on a new kind of beach costume. It comprised two pieces, the bottom large enough to cover its wearer's navel. In May 1946, he advertised it as the world's "smallest bathing suit." Réard named his swimsuit the "bikini," taking the name from the Bikini Atoll, one of a series of islands in the South Pacific where testing on the new atomic bomb was occurring that summer.