This pairing of a dark green long sleeve shirt and grey chinos combines comfort and efficiency and helps keep it low profile yet modern. When this getup looks too polished, play it down with a pair of black leather low top sneakers. On not-so-bone-chilling days, you can wear a variation of this summer-to-fall getup and look absolutely awesome. Great for a 20-something guy if you want to project a laid-back spirit.