Spotted out in Brooklyn yesterday, Michelle Williams was wearing the perfect casual outfit: black leather trousers, cream cable knit jumper layered over a blue denim shirt, leopard-print slip-ons and Ray-Ban Wayfarers. A note on leather trousers: black stretch fake leather can work even better than real, especially if you want a tighter fit (they also cost less – bonus). And look out for proportions: a cropped style can look best – just turn them up if yours are too long.