Teaming a brown turtleneck with beige chinos is an on-point pick for a cool and relaxed outfit. Clueless about how to complete your outfit? Round off with black leather casual boots to step up the classy factor. When temps are dipping and fall is setting in, you'll appreciate how ideal this ensemble is for summer-to-fall weather. This pairing illustrates how men in their 30s kill it in the fashion department.