You'll be surprised at how easy it is for any gentleman to pull together this off-duty outfit. Just a navy and red plaid long sleeve shirt paired with navy jeans. And if you wish to effortlessly dress up this ensemble with a pair of shoes, introduce a pair of black leather casual boots to your look. So so as you can see, it's a killer, not to mention spring-friendly, look to keep in your transeasonal closet. Those wondering how to sport modern casual style as you make it through your 20s, this combination should answer your question.