For a look that's super simple but can be worn in many different ways, reach for a red long sleeve shirt and a black crew-neck t-shirt. Round off your look with a pair of tan suede casual boots for an on-trend on and off-duty mix. This combo is a great idea when it comes to piecing together a standout look for in-between weather. Men who wonder how to rock cool casual outfits as you pass the big 3-0, this ensemble should answer your question.