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29th July 1981: Formal portrait of Lady Diana Spencer (1961 - 1997) in her wedding dress designed by David and Elizabeth Emanuel. (Photo by Fox Photos/Getty Images)

29th July 1981:  Formal portrait of Lady Diana Spencer (1961 - 1997) in her wedding dress designed by David and Elizabeth Emanuel.  (Photo by Fox Photos/Getty Images)

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The Prince and Princess of Wales on the balcony of Buckingham Palace on their wedding day, 29th July 1981. She wears a wedding dress by David and Elizabeth Emmanuel and the Spencer family tiara. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)

The Prince and Princess of Wales on the balcony of Buckingham Palace on their wedding day, 29th July 1981. She wears a wedding dress by David and Elizabeth Emmanuel and the Spencer family tiara. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)

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29th July 1981: Charles, Prince of Wales, with his wife, Princess Diana (1961 - 1997), on the altar of St Paul's Cathedral during their marriage ceremony. (Photo by Hulton Archive/Getty Images)

29th July 1981:  Charles, Prince of Wales, with his wife, Princess Diana (1961 - 1997), on the altar of St Paul's Cathedral during their marriage ceremony.  (Photo by Hulton Archive/Getty Images)

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The Prince and Princess of Wales return to Buckingham Palace by carriage after their wedding, 29th July 1981. She wears a wedding dress by David and Elizabeth Emmanuel and the Spencer family tiara. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)

The Prince and Princess of Wales return to Buckingham Palace by carriage after their wedding, 29th July 1981. She wears a wedding dress by David and Elizabeth Emmanuel and the Spencer family tiara. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)

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Diana, Princess of Wales (1961 - 1997), wearing an Emanuel wedding dress, enters St Paul's Cathedral on the hand of her father, Earl Spencer, for her marriage to Prince Charles, Prince of Wales, London, UK, 29th July 1981. (Photo by Jayne Fincher/Princess Diana Archive/Hulton Royals Collection/Getty Images)

Diana, Princess of Wales (1961 - 1997), wearing an Emanuel wedding dress, enters St Paul's Cathedral on the hand of her father, Earl Spencer, for her marriage to Prince Charles, Prince of Wales, London, UK, 29th July 1981. (Photo by Jayne Fincher/Princess Diana Archive/Hulton Royals Collection/Getty Images)