With haute labels like Prada and Gucci crafting luxe tech wear for the slopes, a motley collection of outdoor apparel makers have likewise made bold strides into the après-ski scene. Here we profile the offerings of a few names you know—and a few new brands that will soon become indispensable—in an effort to add a touch of class, comfort, and function after your day on the mountains. Because, as we all know, the night brings on a whole different kind of adventure.