If the setting calls for a casually classy getup, you can easily rock a tan shirt jacket and dark green chinos. A cool pair of grey canvas high top sneakers is an effortless way to give a hint of stylish nonchalance to this outfit. And if you're in search of a kick-ass winter-to-spring getup, this one is great. When it comes to casual dressing ideas for gents in their 20s, this combination is a good look on most men.