A blue denim jacket and black skinny jeans are the kind of a no-brainer off-duty getup that you need when you have no time to spare. Complete your ensemble with black leather derby shoes to completely change up the look. So when summer is over and fall is taking its place, this ensemble is likely to become your favorite. So if you're on a mission for fashion tips on what to wear as a teenage guy, this pairing is a good example.