On days when comfort is critical, this combination of a navy crew-neck t-shirt and dark green cargo pants is a winner. To introduce a little zing to your getup, introduce a pair of brown leather desert boots to the mix. In winter, when practicality is prized, it can be easy to surrender to a less-than-stylish outfit in the name of practicality. However, this outfit is a bright example that you can actually stay warm and remain stylish at the same time in winter. Sport this getup to create a more conservative look as a gentleman in his 30s.