For a look that's worthy of a modern fashionable guy and casually smart, pair a grey trenchcoat with a white crew-neck t-shirt. White athletic shoes can immediately play down a dressy ensemble. So as you can see, it's a kick-ass, not to mention spring-appropriate, getup to have in your seasonal sartorial arsenal. If you're not sure how to dress as a 20-something, this combo is a winning option.