Designed by London-born Victor Edelstein, the Travolta dress is an off-the-shoulder midnight blue velvet evening gown.

[1] Edelstein recalls the Princess saw a burgundy version of the dress in his studio and requested it be made for her in midnight blue.

She was photographed dancing with actor John Travolta in the Entrance Hall to the music of his 1977 film Saturday Night Fever.

[1] The Princess of Wales wore the dress again in Germany in 1987 and at the premiere of Oliver Stone's film Wall Street in 1988.

[4] Shortly before her death in a car crash in Paris in 1997, Diana requested that the dress be sold in a charity auction.