A dress worn by Princess Diana to a London party on the night a documentary aired in which the then-Prince Charles admitted to adultery during their marriage is going up for auction.

Diana's arrival at the Serpentine Gallery in 1994, wearing a custom-made black silk evening dress by designer Christina Stambolian, became an iconic pop-culture moment. The media dubbed the 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.

According to Sotheby's, 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 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."