London-based collection, Twenty8Twelve, was launched in 2006 by sisters Savannah and Sienna Miller. The sisters chose the name based on the date of Sienna's birthday, December 28th. Twenty8Twelve is a collection described by the duo as being androgynous with a London vibe. While Savannah attended design school in London and worked alongside Alexander McQueen and Matthew Williamson, Sienna plays the part of the muse who adds her own touch of punk rock to the collection.