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WINDSOR, UNITED KINGDOM - MAY 02: Diana, Princess Of Wales At Guards Polo Club. The Princess Is Casually Dressed In A Sweatshirt With The British Lung Foundation Logo On The Front, Jeans, Boots And A Baseball Cap. (Photo by Tim Graham Photo Library via Getty Images)

WINDSOR, UNITED KINGDOM - MAY 02:  Diana, Princess Of Wales At Guards Polo Club.  The Princess Is Casually Dressed In A Sweatshirt With The British Lung Foundation Logo On The Front, Jeans, Boots And A Baseball Cap.  (Photo by Tim Graham Photo Library via Getty Images)