Keira Knightley has enlisted the talents of fashion designer Isaac Mizrahi for her new film role - because she struggles to walk gracefully in her character's high heeled shoes. The Pirates Of The Caribbean and DOMINO star plays a French merchant's wife in dark love story SILK - but needed lessons from the stylist to help her master the uncomfortable footwear. Mizrahi says, "I wanted her to put her weight back then walk foot first, foot first, nice and slow. "She is so much better already."