swimwear of the 1930s and 1940s incorporated increasing degrees of midriff exposure. Coco Chanel made suntans fashionable, and in 1932 French designer Madeleine Vionnet offered an exposed midriff in an evening gown. They were seen a year later in Gold Diggers of 1933. The Busby Berkeley film Footlight Parade of 1932 showcases aquachoreography that featured bikinis. Dorothy Lamour's The Hurricane (1937) also showed two-piece bathing suits. The 1934 film Fashions of 1934 featured chorus girls wearing two-piece outfits which look identical to modern bikinis. In 1934, a National Recreation Association study on the use of leisure time found that swimming, encouraged by the freedom of movement the new swimwear designs provided, was second only to movies in popularity as free time activity out of a list of 94 activities. In 1935 American designer Claire McCardell cut out the side panels of a maillot-style bathing suit, the bikini's forerunner. The 1938 invention of the Telescopic Watersuit in shirred elastic cotton ushered into the end the era of wool. Cotton sun-tops, printed with palm trees, and silk or rayon pyjamas, usually with a blouse top, became popular by 1939. Wartime production during World War II required vast amounts of cotton, silk, nylon, wool, leather, and rubber. In 1942 the United States War Production Board issued Regulation L-85, cutting the use of natural fibers in clothing and mandating a 10% reduction in the amount of fabric in women's beachwear. To comply with the regulations, swimsuit manufacturers produced two-piece suits with bare midriffs. Postwar Fabric shortage continued for some time after the end of the war. Two-piece swimsuits without the usual skirt panel and other excess material started appearing in the US when the government ordered a 10% reduction in fabric used in woman's swimwear in 1943 as wartime rationing. By that time, two-piece swimsuits were frequent on American beaches. The July 9, 1945, Life shows women in Paris wearing similar items. Hollywood stars like Ava Gardner, Rita Hayworth and Lana Turner tried similar swimwear or beachwear. Pin ups of Hayworth and Esther Williams in the costume were widely distributed. The most provocative swimsuit was the 1946 Moonlight Buoy, a bottom and a top of material that weighed only eight ounces. What made the Moonlight Buoy distinctive was a large cork buckle attached to the bottoms, which made it possible to tie the top to the cork buckle and splash around au naturel while