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While you have more freedom with this dress code, there are still clear rules for what not to wear to a black tie optional wedding

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The dress in question, known today as the Revenge Dress, was designed by Christina Stambolian for Princess Diana, who memorably wore the black number on June 29, 1994 to the Serpentine Gallery, the same night that Prince Charles admitted to his affair with Camilla Parker Bowles on national television