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LEEDS, UNITED KINGDOM - MARCH 29: Princess Diana visiting Bristol during her pregnancy with her first son, Prince William. Diana is wearing a coat designed by Bellville Sassoon and a hat designed by milliner, John Boyd. (Photo by Tim Graham Photo Library via Getty Images)

LEEDS, UNITED KINGDOM - MARCH 29:  Princess Diana visiting Bristol during her pregnancy with her first son, Prince William. Diana is wearing a coat designed by Bellville Sassoon and a hat designed by milliner, John Boyd.  (Photo by Tim Graham Photo Library via Getty Images)