This combination of a light blue denim shirt and blue jeans is proof that a straightforward casual look doesn't have to be boring. To add a bit of fanciness to your ensemble, add brown leather knee high boots to the equation. During the winter season, when functionality is prized, it can be easy to surrender to a less-than-stylish ensemble. However, this ensemble is hard proof that you can actually stay warm and remain equally stylish during the winter season.