If you're hunting for a casual yet sharp ensemble, consider teaming a white crew-neck t-shirt with black jeans. Athletic shoes will add a new flavor to an otherwise sober ensemble. In the colder months, when warmth is everything, it can be easy to settle for a less-than-stylish ensemble. This ensemble, however, is a clear example that you can actually stay comfortable and remain equally stylish in the colder months. A reliable option combination proper for 20-something guys who prefer to dress casually.