Novelty lingerie collections Oops! Your Slip is Showing and its more sophisticated sister Madam! Your Slip is Showing purposefully dip below hemlines to jazz up jeans, tunics and dresses. “Throw on one under a daytime dress to meet the girls for cocktails after work,” says Gayle Cruise, a Microsoft marketing director turned designer and owner of Seattle-based Your Slip is Showing. One look’s black ostrich feathers fl utter with every step, recalling Holly Golightly’s elegant LBD, while rosettes trim an embroidered maroon and olive number for a vintage feel. The pieces retail from $150 to $350 and are available at Cantaloup and Nikki Laura boutiques in New York, among other places.