Why not try teaming an olive cable sweater with black chinos? As well as super comfortable, both items look nice when worn together. For something more on the classy end to finish off your outfit, choose a pair of chelsea boots. In the winter season, when comfort is the priority, it can be easy to settle for a less-than-stylish ensemble in the name of practicality. But this ensemble is a shining example that you can actually stay warm and remain stylish during the winter season. And if we're talking casual clothing for 20-year-old gents, this combination is ideal.