During this time, swimming became less about health and more about pleasure. Into the early 1900s, women’s swimming costumes were cumbersome, with high necks, long sleeves, skirts and pants. Often they were made of wool. The one-piece swimming suit, brought to the public attention by swimmer, vaudeville and film star Annette Kellerman, was legally banned in parts of the U.S. In 1908 Kellerman was arrested on a Boston beach for indecent exposure because her swimsuit showed arms, legs and the neck, a costume she adopted from England, and which was similar to men’s swimsuits of the time. Kellerman changed the suit to have long arms and legs and a collar, still keeping the close fit that revealed the shapes underneath.
Despite opposition from some groups, the form-fitting style proved popular. It was not long before swimwear started to shrink further. At first arms were exposed and then legs up to mid-thigh. Necklines receded from around the neck down to around the top of the bosom. The development of new fabrics allowed for new varieties of more comfortable and practical swimwear.
By the 1930s the necklines of women’s swimwear plunged at the back, sleeves disappeared and sides were cut away and tightened. With the development of new clothing materials, particularly latex and nylon, through the 1930s swimsuits gradually began hugging the body, with shoulder straps that could be lowered for tanning.