A long sleeve t-shirt and brown jeans are the kind of a no-brainer casual outfit that you so awfully need when you have no extra time. Rounding off with derby shoes is a surefire way to give a sense of refinement to your outfit. If you're looking for a killer outfit that will take you from winter to spring, this is it. This pairing demonstrates how to score in casual dressing as a 20-something gent.