You're looking at the hard proof that a blue crew-neck sweater and a grey crew-neck t-shirt look amazing when worn together in a relaxed casual ensemble. And if you wish to easily dress up your outfit with a pair of shoes, why not add a pair of dark brown suede desert boots to the equation?
Go for a blue crew-neck sweater and a grey crew-neck t-shirt for a functional menswear style that's also put together. On the fence about how to finish your ensemble? Wear a pair of brown leather derby shoes to kick it up a notch.