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A sketch by British fashion designer Norman Hartnell, of the bridesmaid's dress worn by Princess Anne to the wedding of Princess Margaret and Antony Armstrong-Jones, 1st Earl of Snowdon, May 1960. The dress, a replica of Princess Margaret's first evening dress, is in white silk organza with panels of broderie anglaise and is trimmed with blue ribbons. (Photo by Central Press/Hulton Archive/Getty Images)

A sketch by British fashion designer Norman Hartnell, of the bridesmaid's dress worn by Princess Anne to the wedding of Princess Margaret and Antony Armstrong-Jones, 1st Earl of Snowdon, May 1960. The dress, a replica of Princess Margaret's first evening dress, is in white silk organza with panels of broderie anglaise and is trimmed with blue ribbons.  (Photo by Central Press/Hulton Archive/Getty Images)