A shirt jacket and mint chinos are the kind of a foolproof casual look that you need when you have zero time to spare. For times when this getup appears too polished, tone it down by finishing with a pair of olive athletic shoes. Now that's how you keep it casual at 20.
For a safe classic and casual option, you can always rely on this combo of a shirt jacket and mint chinos. White leather low top sneakers will bring a sense of stylish casualness to an otherwise all-too-safe ensemble. This pairing illustrates how to wow in casual dressing as a gent in his twenties.