A beige denim jacket and olive chinos? This is an easy-to-style getup that anyone could wear on a day-to-day basis. Puzzled as to how to finish off your getup? Wear a pair of brown leather casual boots to spruce it up. So as you can see, it's super easy to look sharp and stay warm when cooler weather hits, thanks to this outfit. And if we're talking casual style tips for guys in their 20s, this look is ideal.