This combination of a tan long sleeve shirt and a white crew-neck t-shirt looks pulled together and instantly makes any gentleman look cool. Why not complete your ensemble with a pair of black leather casual boots for a sense of elegance? This getup is equally cool and comfortable. Now we're talking! As you're moving through your late 20s, you probably want to start dressing more maturely. If that's the case, outfits like this are a never-failing option.