The belted, double-breasted trench is one of those pieces whose classic lines ensure it shows up on shelves year after year. Already have the basic version? Countless brands are experimenting with chic new riffs on the style—edgier silhouettes, unconventional colors, even daring new textures. Click through the slideshow for 17 patterned, ruffled, colored, and otherwise tweaked trenches perfect for the winter-to-spring transition.