This pairing of a black leather biker jacket and navy jeans will be a good exhibition of your prowess in men's fashion even on off-duty days. Serve a little mix-and-match magic by finishing with black leather monks. As you can see here, this combination is a really smart choice, especially for unpredictable fall weather, when the mercury is falling. Semi-casual combos for teen guys aren't actually that hard, as you can see here.