A white and navy plaid long sleeve shirt and light blue jeans are the kind of a never-failing casual outfit that you so awfully need when you have no extra time to spare. To introduce a little fanciness to your outfit, add a pair of brown leather desert boots to the mix. As you can see, it's extremely easy to look awesome and stay comfy when colder weather hits, all thanks to combos like this. Gents who wonder how to rock modern off-duty outfits in your thirties, this combination should answer your question.