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LONDON - NOVEMBER 25: Diana Princess of Wales and Princess Charles arrive at the Film Premiere of Santa Claus at the Odeon Leicester Square in London on November 25, 1985. Diana wore a dress designed by Catherine Walker. (Photo by David Levenson/Getty Images)

LONDON - NOVEMBER 25: Diana Princess of Wales and Princess Charles arrive at the Film Premiere of Santa Claus at the Odeon Leicester Square in London on November 25, 1985. Diana wore a dress designed by Catherine Walker. (Photo by David Levenson/Getty Images)

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LONDON - NOVEMBER 25: Diana Princess of Wales and Princess Charles arrive at the Film Premiere of Santa Claus at the Odeon Leicester Square in London on November 25, 1985. Diana wore a dress designed by Catherine Walker. (Photo by David Levenson/Getty Images)

LONDON - NOVEMBER 25:  Diana Princess of Wales and Princess Charles arrive at the Film Premiere of Santa Claus at the Odeon Leicester Square in London on November 25, 1985.  Diana wore a dress designed by Catherine Walker. (Photo by David Levenson/Getty Images)

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TOKYO, JAPAN - MAY 12: Diana, Princess of Wales at a dinner hosted by Emperor Hirohito in Japan. She is wearing a pleated royal blue evening dress designed by fashion designer Yuki and a sapphire and diamond headband made from jewels which she had reset from the Saudi suite converting the watch into a choker to wear on her forehead. (Photo by Tim Graham Photo Library via Getty Images)

TOKYO, JAPAN - MAY 12:  Diana, Princess of Wales at a dinner hosted by Emperor Hirohito in Japan. She is wearing a pleated royal blue evening dress designed by fashion designer Yuki and a sapphire and diamond headband made from jewels which she had reset from the Saudi suite converting the watch into a choker to wear on her forehead.  (Photo by Tim Graham Photo Library via Getty Images)

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TOKYO, JAPAN - MAY 12: Diana, Princess Of Wales At A Dinner Hosted By Emperor Hirohito In Japan. She Is Wearing A Pleated Royal Blue Evening Dress Designed By Fashion Designer Yuki And A Sapphire And Diamond Headband Made From Jewels Which She Had Reset From The Saudi Suite Converting The Watch Into A Choker To Wear On Her Forehead. (Photo by Tim Graham Photo Library via Getty Images)

TOKYO, JAPAN - MAY 12:  Diana, Princess Of Wales At A Dinner Hosted By Emperor Hirohito In Japan. She Is Wearing A Pleated Royal Blue Evening Dress Designed By Fashion Designer Yuki And A Sapphire And Diamond Headband Made From Jewels Which She Had Reset From The Saudi Suite Converting The Watch Into A Choker To Wear On Her Forehead.  (Photo by Tim Graham Photo Library via Getty Images)