This off-duty pairing of a dark green polo and grey chinos is very easy to throw together in next to no time, helping you look sharp and prepared for anything without spending a ton of time combing through your closet. Introduce grey athletic shoes to the mix to bring a hint of stylish effortlessness to this outfit. This combo is a viable choice if you're figuring out a neat summer-to-fall look. This getup shows how to succeed in casual dressing as a 20-year-old man.