This casual pairing of a blue long sleeve shirt and cargo pants is very easy to pull together without a second thought, helping you look on-trend and ready for anything without spending too much time searching through your wardrobe. To give your overall look a classier finish, complete your look with a pair of black leather casual boots. This one is a good choice if you're picking out a knockout ensemble that will take you from summer to fall. That's what you wear to impress the heck out of people as a 20-year-old gentleman.