Oddly enough, the two-piece swimsuit—which usually consisted of a structured halter top and modest bottom that covered the navel, hips, and derrière—arrived with much less fanfare than the bikini. By the early '40s, film stars including Ava Gardner, Rita Hayworth, and Lana Turner were all wearing the two-piece, and it was seen frequently on American beaches. Why were the inches of skin above the bellybutton so much less controversial than those below it? Hollywood's Hays production codes allowed two-piece gowns but prohibited navels on-screen. That meant the rib cage earned a ho-hum reputation, but the bellybutton was uncharted territory.