A navy trenchcoat and a yellow long sleeve shirt are absolute mainstays if you're putting together a polished closet that matches up to the highest sartorial standards. Complement this ensemble with a pair of black suede snow boots to avoid looking too polished. This one is an exciting choice when it comes to a knockout look that will take you from summer to fall. Overall, a savvy option if we're talking fashion tips for 20-year-old guys.