A grey wool turtleneck and navy jeans are the kind of a never-failing casual outfit that you so desperately need when you have zero time. In the footwear department, go for something on the laid-back end of the spectrum by sporting white athletic shoes. So as you can see, it's a kick-ass, not to mention spring-friendly, ensemble to keep in your seasonal rotation. This pairing demonstrates how to slay in casual dressing as a teenage guy.