So as you can see, looking casually neat doesn't take that much effort. Just rock a navy and green plaid suit with a dark green turtleneck and be sure you'll look amazing. To infuse an air of stylish casualness into this ensemble, introduce white leather low top sneakers to the mix. So as you can see, it's a killer, not to mention spring-appropriate, getup to have in your transitional rotation. A no-brainer ensemble proper for 20-something guys.