If the situation calls for a casually neat look, opt for a dress shirt and cargo pants. Complement this ensemble with dark brown leather casual boots and ta-da: the outfit is complete. This combination is a shining example that you don't have to give up style for practicality during winter. As a 30-year-old man, you want to start dressing like an adult. If that's the case, ensembles like this are a life saver.