Remember a few years ago when Birkenstocks used to make us cringe? And then how last summer they were the only things we were wearing? Well, white jeans are this year's fugly sandals. Whitewash all '80s George Michael connotations from your mind and look at this snap of Alexa Chung at the Vogue Festival last weekend. Unlike the white jeans of the olden days, AC's are tight, cropped and tailored — no fraying here. This is a smart girl approach to summer pants. The addition of flats and a T-shirt keeps it all casual, lo-fi and, crucially, cool. Want to up the ante? Tuck in a white shirt and stay away from dirt.