You'll be surprised at how very easy it is for any man to put together this off-duty getup. Just a black embroidered long sleeve shirt and dark green cargo pants. Go ahead and complement your outfit with a pair of dark green athletic shoes for a dose of stylish nonchalance. Overall, perfect for a younger guy.
If you appreciate comfort dressing, consider pairing a light blue denim shirt with dark green cargo pants. Get a bit experimental on the shoe front and dial down your ensemble by rocking dark green athletic shoes. This combination shows that as a 20-something guy, you have a wide array of styling options.