Apparently some women have a hard time dressing down:
Slader also suggests looking at the choices made by women in the public eye to assess what works. "Twiggy looks great in her white linen trousers," she says, "but Helen Mirren, who looks fabulous on the red carpet, tries to be too vampy in black leather when she's dressing down. Kristin Scott Thomas looks classic in jeans and a simple shirt, but Victoria Beckham is bad at dressing casually - those wedge trainers she wore in LA recently were ridiculous. Sienna and Savannah Miller always look lovely in natural fabrics."