To-the-knee? Sure. Ankle-length? OK. Mid-calf? Huh? Better get used to it—it's time to invest in a new hemline. With the return of ladylike dressing, three-quarter-length skirts are on the rise everywhere from Calvin Klein Collection and Narciso Rodriguez to Rodarte and Roland Mouret. Versus and Prabal Gurung showed them second-skin tight, but Hannah MacGibbon gave Chloé's a lift with pleats, sheer fabrics, and easy-on-the-feet ballet flats.