Let's face it, when we think of sweaters, cardigans automatically come to mind -- this is the era of extreme layering after all. But having lived in an open-stitch pullover sweater all summer, I've realized how one can transform a wardrobe. Not only are they easy to take on and off, but they also go with practically everything, including cropped pants and pencil skirts a la Joan Holloway of "Mad Men." Since pullover sweaters simplify a look, choose one that has a bit of embellishment, pattern, intricate stitching, or color to kick up the panache-factor without the heavy use of accessories. I wouldn't recommend ditching all your cardigans this fall, but maybe one of these 10 wardrobe-transforming pullover sweaters will get some heavy rotation in your style life.