Sorry, as far as knits and sweaters are concerned, cashmere isn't always the best. Besides the fact that most of it pills something awful—resulting in those annoying little bumps of fabric on cardigans and sweaters, merino wool is just as good, and with ringspun cotton and terry fleece being popular choices for throwback hoodies and sweatshirts from companies like Reigning Champ and Left Field, there are plenty of other luxurious options for keeping warm this winter.