Why not team a light blue shirt jacket with blue jeans? These two items are very functional and will look good when worn together. Add a pair of black leather casual boots to the equation and you're all set looking killer. A nice, less conservative combo for a guy in his twenties.
A light blue shirt jacket and blue jeans are the kind of a no-brainer off-duty look that you so terribly need when you have no time. Have some fun with things and introduce red canvas high top sneakers to your look. A fail-safe option pairing proper for 20-year-old men who like to dress casually.