For an effortlessly smart menswear style, try pairing a blue trenchcoat with a navy turtleneck — these two pieces fit perfectly together. Clueless about how to complete this outfit? Finish with a pair of brown leather tassel loafers to dial up the classy factor. As you're transitioning from your 20s to your 30s, you want to start dressing more professionally. That's when getups like this become a great source of inspiration.