It's a little too easy to call any given Diana dress "iconic", though her final Mario Testino photoshoot certainly gave this green velvet buttoned dress its place in history. She was said to have capitalized on the jacket styling by ordering a matching jacket made for Charles. The Catherine Walker dress sold for $24,150 at her 1997 Christie's dress auction.
The Diana dresses are certainly drawing the press for this exhibition, but what intrigues me the most are the items from Princess Margaret. The dresses and accessories from the Queen's late sister include a scarf hand painted for Margaret by Christian Dior himself. There were few more glamorous than Margaret in her heyday, so you know her wardrobe yields some true treasures.
For more sneak peeks at Fashion Rules Revisited, see this fantastic Vogue article and gallery, or photos at the Daily Mail.
Photos: via Getty Images