Pairing a white crew-neck t-shirt with black cargo pants is a smart option for a casual look. Wondering how to finish off your ensemble? Round off with a pair of black leather loafers to amp it up. Seeing as it is getting chillier every day, this look appears a viable choice for the time in between seasons. As a gentleman in his thirties, you probably want to start dressing like an adult man. That's when combos like this are a solid bet.