A dark green windbreaker and a white knit wool turtleneck are a good outfit to add to your casual arsenal. Rounding off with a pair of black leather casual boots is a simple way to add a bit of fanciness to this look. So as you can see here, it's a killer, not to mention season-appropriate, look to keep in your seasonal rotation. An ensemble like this will help any gent in his 20s outdo his peers.