There’s nothing we love better than a fashion designer wearing a get-up that you’d expect to see on a busker. Not that we’ve got anything against buskers, mind – it’s just that they usually dress to accommodate a few knee bends and to fend off the cold. We wonder what one half of fashion duo Twenty8Twelve and one time style icon Sienna Miller was thinking when she layered this Derek Trotter gilet over a tracksuit top and "fun" trousers, which suspiciously look like pyjama bottoms. Maybe she’s been spending too much time with the man who’s perfected the "I slept in a bus shelter last night" look, Rhys Ifans.
Has Sienna lost it?