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1957: A young African-American woman stands between large rocks at the seashore, smiling and modeling a bathing suit. (Photo by Hulton Archive/Getty Images)

1957:  A young African-American woman stands between large rocks at the seashore, smiling and modeling a bathing suit.  (Photo by Hulton Archive/Getty Images)

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circa 1955: A model in a bathing suit sits on the prow of canoe. (Photo by George Pickow/Three Lions/Getty Images)

circa 1955:  A model in a bathing suit sits on the prow of canoe.  (Photo by George Pickow/Three Lions/Getty Images)

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circa 1955: Two women, one wearing a one-piece bathing suit, the other a two-piece, smile as they sit back-to-back on a beach. (Photo by Harold M. Lambert/Lambert/Getty Images)

circa 1955:  Two women, one wearing a one-piece bathing suit, the other a two-piece, smile as they sit back-to-back on a beach.  (Photo by Harold M. Lambert/Lambert/Getty Images)

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1st November 1954: A woman modelling a beach outfit with a patchwork design, consisting of shorts, a bra top and co-ordinated shirt. (Photo by Chaloner Woods/Getty Images)

1st November 1954:  A woman modelling a beach outfit with a patchwork design, consisting of shorts, a bra top and co-ordinated shirt.  (Photo by Chaloner Woods/Getty Images)

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Six attractive young women in two piece bathing suits sit in a row on modern stools, circa 1952. (Photo by Underwood Archives/Getty Images)

Six attractive young women in two piece bathing suits sit in a row on modern stools, circa 1952. (Photo by Underwood Archives/Getty Images)