For a casually dapper outfit, pair a long sleeve t-shirt with black shorts — these two items work nicely together. Boost the formality of this outfit a bit by slipping into black leather monks. Undoubtedly, you're looking at a savvy idea for a blazing hot warm weather afternoon. As a 30-year-old gent, you want to start dressing more like a mature gentleman. If that's the case, getups like this are perfect as inspiration.