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British royal Diana, Princess Of Wales (1961-1997), wearing a burgundy velvet evening dress by Catherine Walker, with a pearl necklace, attends the premiere of 'Back To The Future' at the Empire cinema in Leicester Square, London, England, 3rd December 1985. (Photo by Princess Diana Archive/Getty Images)

British royal Diana, Princess Of Wales (1961-1997), wearing a burgundy velvet evening dress by Catherine Walker, with a pearl necklace, attends the premiere of 'Back To The Future' at the Empire cinema in Leicester Square, London, England, 3rd December 1985. (Photo by Princess Diana Archive/Getty Images)

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LONDON, UNITED KINGDOM - DECEMBER 03: The Princess Of Wales Attends The Premiere Of 'back To The Future' At The Empire Cinema, Leicester Square, London Wearing A Burgundy Velvet Evening Dress Designed By Fashion Designer Catherine Walker And Pearls Down Her Back (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 03:  The Princess Of Wales Attends The Premiere Of 'back To The Future' At The Empire Cinema, Leicester Square, London Wearing A Burgundy Velvet Evening Dress Designed By Fashion Designer Catherine Walker And Pearls Down Her Back  (Photo by Tim Graham Photo Library via Getty Images)

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LONDON, UNITED KINGDOM - DECEMBER 03: The Princess Of Wales Attends The Premiere Of 'back To The Future' At The Empire Cinema, Leicester Square, London Wearing A Burgundy Velvet Evening Dress Designed By Fashion Designer Catherine Walker And Pearls Down Her Back (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 03:  The Princess Of Wales Attends The Premiere Of 'back To The Future' At The Empire Cinema, Leicester Square, London Wearing A Burgundy Velvet Evening Dress Designed By Fashion Designer Catherine Walker And Pearls Down Her Back  (Photo by Tim Graham Photo Library via Getty Images)