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The Princess of Wales visits Sandhurst Royal Military Academy in Surrey, wearing a Catherine Walker suit and a hat by Graham Smith at Kangol, April 1987. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)

The Princess of Wales visits Sandhurst Royal Military Academy in Surrey, wearing a Catherine Walker suit and a hat by Graham Smith at Kangol, April 1987. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)