If you're looking for a relaxed casual and at the same time stylish look, opt for a gilet and white jeans. Complement your outfit with beige low top sneakers and ta-da: the ensemble is complete. So as you can see, it's very easy to look stylish and stay toasty when cooler weather hits, all thanks to combos like this one. Sport this combination to show your maturity even as a 20-something guy.