You'll be amazed at how very easy it is for any guy to pull together this casually classic look. Just a dark green shirt jacket and olive chinos. Introduce a pair of black and white canvas low top sneakers to your outfit to effortlessly kick up the style factor of this outfit. On not-so-chilly days, rock a version of this easy-to-transition look and look absolutely amazing. Now that's how you keep it casual as a young gent.