The revolutionary fashion designer credited with pioneering the “The American Look,” Claire McCardell designed for the emerging active lifestyle of women in the 1940s and 50s. She was the originator of mix-and-match separates, pedal-pushers, bareback summer dresses, strapless swimsuits, and feminine denim fashion, and started the trend for ballet flats—a signature Audrey Hepburn look—as a wartime leather-rationing measure. McCardell’s fashions were taken up by working women and high society alike. The early episodes of Madmen are packed with fashion showing Claire McCardell’s influence. On vintage fashion blogs and in books like Slim Aarons’s Once Upon A Time , there are wonderful photographs from the period of clotheshorses Slim Keith, Babe Paley, and C.Z. Guest looking impossibly chic in McCardell fashions for their leisure-time activities. First published in 1955, What Shall I Wear? is a distillation of McCardell’s democratic fashion philosophy and a practical guide to looking effortlessly stylish, without enslavement to expensive and confining Parisian designs. A retro treat full of charming illustrations, instructions for sewing some of her classic designs, and still-solid advice including the designer’s “McCardellisms,” What Shall I Wear? is a tribute to the American spirit in fashion, carried on today by such designers as Marc Jacobs, Isaac Mizrahi, Anna Sui, and Michael Kors.