From Gucci and Loewe to Chloé and Isabel Marant, Sienna Miller has rocked pretty much every designer label – not to mention new-season trend – on her promotional tour of new movie GI Joe. And yesterday she upped the ante again, rocking five outfits in just one day. (That's fashion dedication, Sienna.) But contrary to what you might think, her fashion marathon isn't as much fun as it looks. ‘To be honest, at this point of the promotional tour I'd wear a bin bag if it was put in front of me. Any sense of my own personal fashion behaviour has gone out of the window,' she said this weekend, before explaining why she's not wearing clothes from her own label. ‘The Topshop jeans [that she was pictured wearing in Australia last month] were at hand and the Twenty8Twelve ones were in the wash.' Well, who needs to make a trip to the laundrette when your suitcase is bulging with multiple outfit changes, eh?