What a difference a season makes. Vivienne Westwood replaced fall’s hot babes with spring’s prim Ladies Who Lunch. In a strong play on Fifties silhouettes, there were full skirts, tailored dresses in opulent jacquard, twinsets, little white gloves, pillbox and boater hats and cropped cigarette trousers. The palette ranged from crimson and fuchsia to navy, black and gold, while among the fabrics were crisp white cottons, Lurex, diaphanous silks, luxe brocades and jacquards. But don’t be fooled, there was still some of that Dame Viv cheekiness — literally — in the form of two strapless, buttock-baring bathing suits.