Harriet Walker on the gravity-defying trend that's stepping out of a salon near you In fashion terms, the rule of hair couldn't be more simple: the bigger it is, the richer you are. Glossiness, high shine and tamed flyaways – these are all by the by: time was, you were nobody until your hair took up most of the room. Thankfully, 'dos have deflated a little in recent years, with stars and stylists opting for a more natural look. They've been using minimal products, and called an amnesty on the lungfuls of hairspray and the scalp-punishing back-combing of yesteryear. But big hair has made a comeback, appearing most recently above the smiling faces of fashion luvvies Cheryl Cole and Sarah Jessica Parker. After so many seasons of sleek blow-drys and elegant chignons, their riotously bouffant locks, primped and oomph-ed, were shamelessly redolent of the lacquered coifs of the Sixties and starchy 1980s power 'dos.