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Princess Diana (1961 - 1997) with Princess Margaret (1930 - 2002) and President Francesco Cossiga during a banquet held at the V&A Museum in honour of the Italian state, October 1990. The Princess is wearing a Victor Edelstein dress. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)

Princess Diana (1961 - 1997) with Princess Margaret (1930 - 2002) and President Francesco Cossiga during a banquet held at the V&A Museum in honour of the Italian state, October 1990. The Princess is wearing a Victor Edelstein dress. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)