Putting together a long sleeve t-shirt and beige chinos will be a good illustration of your prowess in menswear styling even on off-duty days. Avoid looking too casual by rounding off with a pair of oxford shoes. This one is an appealing choice if you're scouting for a knockout outfit that transitions easily into fall. As a guy in his thirties, you want to start dressing with more class. If that's the case, outfits like this are ideal as inspo.