If you're in search of a laid-back but also stylish outfit, choose a tan crew-neck sweater and dark green chinos. Rounding off with a pair of white leather low top sneakers is a guaranteed way to introduce a hint of stylish nonchalance to this outfit. Keep this combo in your head when spring comes, and we promise you'll save time crafting an outfit on more than one occasion. So if you're searching for a nice yet mature outfit for a 20-year-old gentleman, look no further.