Marry a white long sleeve shirt with olive dress pants if you're aiming for a proper, dapper ensemble. Our favorite of an infinite number of ways to finish this outfit is dark green leather brogues.
White Long Sleeve Shirt with Dark Green Leather Brogues Outfits
This relaxed casual pairing of a white long sleeve shirt and beige cargo pants is a real lifesaver when you need to look cool but have no time. You could perhaps get a bit experimental on the shoe front and introduce a pair of dark green leather brogues to the mix.