They were a black velvet and beaded gown worn for a Vanity Fair photo shoot by Mario Testino at Kensington Palace in 1997, and a burgundy crushed velvet gown theprincess wore to the film premiere of "Back to the Future" in 1985.
Kensington Palace was home to both the princes when they were being brought up by their mother Diana, thePrincessof Wales, who lived there from 1981 until her death in 1997.