Christina Stambolian dress from 1994 has defined a whole category of fashion and is expected to fetch up to £220,000

Princess Diana's "revenge dress," which she wore to a Serpentine Gallery fundraiser in 1994, will be auctioned by Sotheby's New York on Dec. 9.

Worn by Diana, Princess of Wales to an event at London 's Serpentine Gallery in June 1994, her little black dress didn't merely set a trend - it inspired a whole genre.

The dress is estimated to sell for between £110,000 and £220,000

Its estimated worth? Somewhere between $150,000 and $300,000.