If you're on the lookout for a casual and at the same time on-trend look, reach for a white wool turtleneck and grey houndstooth chinos. Add white and black leather low top sneakers to the mix et voila, the ensemble is complete. As you can imagine, this is a kick-ass option come warmer days. Semi-casual outfits for stylish 20-something guys aren't actually that hard, as you see.