For an ensemble that's street-style-worthy and effortlessly classic, marry a sweater vest with black chinos. You can get a bit experimental on the shoe front and introduce a pair of black loafers to the mix. As the weather starts getting warmer, it's time to get rid of those bulky winter layers and choose something lighter, like this look here. Modern and ideal for a teenager, an ensemble like this will help upstage any of your peers.