This pairing of an aquamarine long sleeve shirt and white jeans is proof that a simple casual ensemble doesn't have to be boring. Our favorite of a great number of ways to finish this outfit is with a pair of dark brown suede desert boots. In the winter season, when functionality is a must, it can be easy to settle for a less-than-stylish ensemble. This ensemble, however, is a bright example that you can actually stay toasty and remain equally stylish during the winter season. As a 30-something Millennial gent, you want to start dressing like an adult man. If that's the case, outfits like this are a fail-safe option.