When it comes to masculine refinement, this combination of a grey plaid shirt jacket and a white long sleeve shirt doesn't disappoint. And if you wish to easily dress down your ensemble with a pair of shoes, why not complete your outfit with white canvas low top sneakers? So as you can see, it's a stylish, not to mention season-appropriate, combo to have in your seasonal collection. And if we're talking casualwear for 20-year-old guys, this getup is ideal.