Princess Diana's "revenge dress", worn at a Vanity Fair party in London just hours after then-Prince Charles admitted in a television interview to an affair with Camilla Parker-Bowles, is going up for auction.

Her dramatic arrival at the Serpentine Gallery in 1994 in a custom-made black silk evening dress by designer Christina Stambolian became an iconic pop-culture moment.

The media dubbed her outfit the "revenge dress".

Auction house Sotheby's expects the dress to sell for up to $300,000 (£220,000) when it goes under the hammer on 9 December.

A press release from Sotheby's said it is the first time the dress has been offered at auction since 1997, when the late princess sold 79 of her dresses to raise money for charities.

Morgane Halimi, Sotheby's Global Head of Handbags and Fashion, said in a statement that Princess Diana "understood instinctively" that fashion can be a language in its own right.

"On her own terms, Princess Diana turned the dress into one of the most powerful messages she ever made, during one of the most scrutinised and emotionally charged episodes of her life," Halimi said.

"She walked into a moment in which so much of her story was being told for her and, through what she chose to wear, reclaimed the narrative for herself."

According to Sotheby's, Anna Harvey, her stylist at the time, said Diana "wanted to look a million dollars".

The princess made a last-minute wardrobe change for the fundraising dinner and chose the strapless evening dress by the Greek designer Christina Stambolian - which she accessorised with a royal jewel, a black clutch and black pumps.

The vintage Jaguar XJ40 car that Diana arrived in at the event was sold at auction earlier this year for £66,250.

The revenge dress is expected to fetch a considerably higher price.

If it does, it will not be the first time an item from the princess's wardrobe has sold for a significant sum.

Princess Diana's sweater featuring a black sheep among rows of white ones was sold for £920,000 at an auction by Sotheby's in New York in 2023.