Designers make their marks on the runways each season, but these days that’s not enough. Fashion mainstays like Christopher Kane, Prabal Gurung and Alber Elbaz have teamed up with beauty brands to create collections that expand their aesthetic to makeup bags across the world. And on a larger scale, major fashion houses are now practically required to have a chic selection of beauty offerings. Here, we explore the lines that have made a very stylish impact.