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LONDON, UNITED KINGDOM - MAY: Sketch of the wedding dress to be worn by Princess Margaret for her wedding with Antony Armstrong Jones - The dress is designed by Norman Hartnell and is of white organza - in May 1960 in London, United Kingdom. (Photo by Keystone-France/Gamma-Rapho via Getty Images)

LONDON, UNITED KINGDOM - MAY: Sketch of the wedding dress to be worn by Princess Margaret for her wedding with Antony Armstrong Jones - The dress is designed by Norman Hartnell and is of white organza - in May 1960 in London, United Kingdom. (Photo by Keystone-France/Gamma-Rapho via Getty Images)