And Dear Frances' most recent launch, the Ayr Mule, is sure to catch on just as quickly. It's an updated take on the brand’s traditional mule, inspired by Danish mid-century modern furniture and featuring curved leather detailing and a unique tortoise Plexiglas heel. That it comes in neutral colors — black and olive — will only add to the sell-out factor. And not only can we envision this style on the same It-girl set, spurring sales, but get this: Only 50 pairs of each colorway are being produced.