Rock a dark brown cable sweater with a navy and white gingham long sleeve shirt if you want to look neat and relaxed without exerting much effort. A pair of brown leather casual boots will take this ensemble in a more sophisticated direction. When it's one of those dreary autumn days, sometimes only a killer look like this one can get you out the door in the morning. As a guy in his 30s, you want to start dressing like a grown-up. If that's the case, outfits like this are a real life saver.