This semi-casual combo of a white crew-neck t-shirt and charcoal dress pants can take on different moods depending on the way you style it. Our favorite of a great number of ways to finish off this outfit is dark brown suede tassel loafers. Keep this combination in your head come warmer weather, and we guarantee you'll save a lot of time racking your brain for what to wear on more than one occasion. As a 30-something, you want to start dressing with more class. If that's the case, combos like this are a tested option.