For a casually neat getup, consider pairing an olive shirt jacket with a white vertical striped long sleeve shirt — these pieces fit pretty good together. Keep this getup in your front hall closet come warmer days, and we promise you'll save time racking your brain for what to wear on more than one morning. As you're transitioning from your 20s to your 30s, you want to start dressing more like a mature gentleman. That's when combinations like this are a never-failing option.