This casual pairing of a denim jacket and dark brown corduroy jeans is a life saver when you need to look dapper in a flash. Get a bit experimental in the footwear department and add a pair of cowboy boots to your ensemble. As you can see here, it's extremely easy to look on-trend and stay toasty when fall arrives, all thanks to combos like this one. Gents who are curious how to rock cool casual outfits as you go into your 30s, you have your answer.