Why not pair a light blue long sleeve shirt with chinos? Both of these items are totally functional and look awesome worn together. The whole look comes together if you add tan slip-on sneakers to the equation. This getup is probably what you've been looking for as a teenager.
Tan Slip-on Sneakers with Chinos Outfits In Their Teens
A white open cardigan and chinos are essential in any man's versatile off-duty closet. Let your sartorial savvy truly shine by finishing your outfit with tan slip-on sneakers. Outfit inspiration like this will help you look incredibly fashionable as you progress through your adolescence.