An olive long sleeve shirt and a white polo are the kind of a tested casual combo that you need when you have no time to pull together an ensemble. To add a little zing to your ensemble, complement this ensemble with a pair of dark brown leather casual boots. So so as you can see, it's a killer, not to mention season-appropriate, combo to have in your seasonal rotation. Those who are curious how to sport modern off-duty outfits as you move through your 20s, this combination should answer your question.