The combo of a black turtleneck and white chinos makes for a cool laid-back getup. You could perhaps get a little creative with shoes and introduce black leather monks to the equation. Style like this is what will gain you recognition and respect from your peers and everyone else in the long run.
A black turtleneck and white chinos are a wonderful combination that will easily carry you throughout the day. If you want to immediately dress down your outfit with one single piece, introduce a pair of white leather low top sneakers to the equation. Overall, an ideal demonstration of smart fashion for 20-year-old gents.
Go for a black turtleneck and white chinos for a daily outfit that's full of style and personality. Take cues from combinations like this if you're aiming to add maturity to your 20-year-old's wardrobe.