Irrefutable proof that a navy dress shirt and an aquamarine plaid overcoat are amazing when paired together in a sophisticated look for today's gentleman. For maximum style points, introduce a pair of brown leather double monks to this look. This getup is a really nice idea, especially for autumn, when the temperature is dropping. So if you're looking for a nice yet mature getup for a 20-year-old guy, this one fits the task well.