For an effortlessly sophisticated ensemble, consider wearing an overcoat and a green-yellow turtleneck — these two items fit nicely together. You could perhaps get a bit experimental with footwear and play down this ensemble by finishing with a pair of black athletic shoes. As days are getting cooler, you'll see that an ensemble like this is ideal for the season. All in all, a perfect demonstration of casual style for 30-something Millennial men.