Ensemble of dress, knickerbockers, belt and hat, designed by Mary Quant, London, 1958.  Knickerbockers, part of an ensemble with grey flannel dress and hat. The knickerbockers are knee length with a flat pleated frill and white metal button at the knee. They fasten at the back with a zip fastener. Belt, part of an ensemble consisting of a dress of grey flannel, knickerbockers and hat. The matching…