In the early 1930s, the textile trade journals applauded the increasing stress on styling as a means of encouraging the consumer to buy a new suit rather than to use "last year's." Stylishness was introduced into knitted suits through the use of a greater range of solid colors. Parti-colored suits, with stripes and slashes of a second or even a third color, were also featured (fig. 18). Knitting mills were pressed to introduce novelty effects such as mesh, waffle motifs, and lace patterns in knitted fabrics. [Illustration: Figure 18. ONE-PIECE SWIMMING SUITS OF KNITTED WOOL, 1930. (_Courtesy of Cole of California._)] The insistent emphasis on novelty encouraged the development of such items as all-rubber swimming suits with embossed surfaces simulating knitted textiles. Although this innovation was not successful, because the suits were clammy and easily torn, rubber did find a definite use in swimming suits with the introduction of Lastex--a yarn made with a core of rubber wrapped by a fine thread of another fiber. The following advertisement for swimming suits made with Lastex best explains why this important innovation is still valued by the industry today: There's no wrinkle, no bag, no sag, even under the most ruthless sun! No other human device can even approximate that utter freedom, that perfection of fit, at rest or in motion, that airy but strictly legal sense of wearing nothing at all. There is no substitute for this elastic yarn, which imparts lasting elasticity to any fabric.[67] [67] _Harper's Bazaar_ (June 1934), 68th year, no. 2660, p. 9. Having exhausted the novelty effects of knitted swim suits, women in the late 1930s began to respond eagerly to the wide range of decorative possibilities found in woven fabrics. Cotton and the relatively new man-made fibers such as Celanese acetate and Dupont rayon were used in fabrics such as ginghams, chambrays, piques, and featherweight elastic satins. To the pleasure of the fashion editors, who claimed to be anxious for some relief from the nudity of the maillot, suits of woven fabrics were made with flared skirts. These had knitted linings of cotton, acetate, or wool which satisfied any taste as to warmth or coolness on the beach. The belief was prevalent that a wool swimming suit was needed for warmth. In the 1940s the two-piece, bare-midriff suit with tight shorts or flared skirt was a popular and logical development from the earlier suits with cut-out sections around the midriff. The more extreme French bikini, however, was not adopted by American women when it was first introduced in the 1940s.