It began with Quant's drive to make her clothes part of a total look. For help, she went to her hairdresser Vidal Sassoon, another young London upstart who was aiming to revolutionize his trade. In his 1968 memoir I'm Sorry I Kept You Waiting Madam, he tells how Quant came to him with a problem about the show she was about to put on. White smooth calf leather lace-up sneaker trimmed with...