A grey crew-neck sweater and navy chinos are great menswear staples that will integrate perfectly within your current casual arsenal. Get a bit experimental with shoes and play down this look by sporting a pair of white and green leather low top sneakers. With springtime in the air, it's time to put on simple and on-trend ensembles, just like this one. And if we're talking casual fashion tips for teenage boys, this getup looks good on most guys.