A tan polo neck sweater and black chinos will add smart style to your day-to-day repertoire. Finishing off with black leather desert boots is a simple way to bring a dose of stylish nonchalance to this getup. So so as you can see, it's a neat, not to mention season-appropriate, getup to keep in your seasonal rotation. Definitely a nice idea when it comes to outfit ideas for 20-year-old men.