Keira Knightley's purple dress just won't go away. First, we had Elie Saab taking notes from Erdem with new versions of the romantic, frilled frock. Now have got in on the act with their own version, almost identical save for the shoulder strap (which could easily be cut off if you want to be a true Keira clone). It's yours for £55 if you fancy it, and it's also available in petite if you're not as long and leggy as Ms Knightley.