Pair a dark brown shirt jacket with a white and navy print crew-neck t-shirt if you wish to look casually dapper without trying too hard. Balance out this ensemble with a classier kind of shoes, such as this pair of dark brown leather casual boots. This combination is an exciting pick if you're on the hunt for an easy-to-transition ensemble. This ensemble proves that as a 30-year-old guy, you have a wide range of dressing options.