A crew-neck sweater and brown chinos are both versatile menswear must-haves that will integrate perfectly within your day-to-day fashion mix. And if you want to immediately dress up this look with one item, complement your outfit with a pair of tobacco brogues. So so as you can see, it's a cool, not to mention season-appropriate, getup to have in your transeasonal collection. Smart casual looks for 20-year-old gentlemen aren't actually that hard, as you can see here.