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English model Twiggy sits cross-legged in an exotic tent constructed in Justin de Villeneuve's home, early 1970s. (Photo by Justin de Villeneuve/Hulton Archive/Getty Images)

English model Twiggy sits cross-legged in an exotic tent constructed in Justin de Villeneuve's home, early 1970s. (Photo by Justin de Villeneuve/Hulton Archive/Getty Images)

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Bianca Jagger wearing a gold lame dress; circa 1970; New York. (Photo by Art Zelin/Getty Images)

Bianca Jagger wearing a gold lame dress; circa 1970; New York. (Photo by Art Zelin/Getty Images)

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A young woman poses in a purple pleated miniskirt with a yellow top and an orange patterned scarf, circa 1970. (Photo by Jamie Hodgson/Getty Images)

A young woman poses in a purple pleated miniskirt with a yellow top and an orange patterned scarf, circa 1970. (Photo by Jamie Hodgson/Getty Images)

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22nd September 1970: Modelled by Moica Platner, a black and silver open fronted dress in silk jersey with matching hood (Photo by Evening Standard/Getty Images)

22nd September 1970:  Modelled by Moica Platner, a black and silver open fronted dress in silk jersey with matching hood  (Photo by Evening Standard/Getty Images)

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The Three Degrees (Sheila Ferguson, Valerie Holiday, Fayette Pickney), a American female singing group pictured in a London street. (Photo by Tim Graham/Getty Images)

The Three Degrees (Sheila Ferguson, Valerie Holiday, Fayette Pickney), a American female singing group pictured in a London street.   (Photo by Tim Graham/Getty Images)