although it became accepted swimsuit attire for women in parts of Europe by 1910. Even in 1943, pictures of the Kellerman swimsuit were produced as evidence of indecency in Esquire v. Walker, Postmaster General. But, Harper's Bazaar wrote in June 1920 (vol. 55, no. 6, p. 138) - "Annette Kellerman Bathing Attire is distinguished by an incomparable, daring beauty of fit that always remains refined." The following year, in June 1921 (vol. 54, no. 2504, p. 101) it wrote that these bathing suits were "famous ... for their perfect fit and exquisite, plastic beauty of line." Female swimming was introduced at the 1912 Summer Olympics. In 1913, inspired by that breakthrough, the designer Carl Jantzen made the first functional two-piece swimwear, a close-fitting one-piece with shorts on the bottom and short sleeves on top. Silent films such as The Water Nymph (1912) saw Mabel Normand in revealing attire, and this was followed by the daringly dressed Sennett Bathing Beauties (1915–1929). The word "swimsuit" was coined in 1915 by Jantzen Knitting Mills, a sweater manufacturer who launched the Red Diving Girl swimwear brand. The first annual bathing suit day at New York's Madison Square Garden in 1916 was a landmark. The swimsuit apron, a design for early swimwear, disappeared by 1918, leaving a tunic covering the shorts. During the 1920s and 1930s, people began to shift from "taking in the water" to "taking in the sun" at bathhouses and spas, and swimsuit designs shifted from functional considerations to incorporate more decorative features. Rayon was used in the 1920s in the manufacture of tight-fitting swimsuits, but its durability, especially when wet, proved problematic, with jersey and silk also sometimes being used. Burlesque and vaudeville performers wore two-piece outfits in the 1920s. The 1929 film Man with a Movie Camera shows Russian women wearing early two-piece swimsuits which expose their midriff, and a few who are topless. Films of holidaymakers in Germany in the 1930s show women wearing two-piece suits. Actress Dolores del Río was the first major star to wear a two-piece women's bathing suit onscreen in Flying Down to Rio (1933). Necklines and midriff By the 1930s, necklines 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. Women's