Try pairing a turtleneck with blue jeans for standout menswear style. And if you need to immediately perk up this look with one item, introduce a pair of white derby shoes to the equation. This is a never-failing option for a knockout winter-to-spring outfit. As a guy in his 30s, you want to start dressing like an adult man. If that's the case, looks like this are a real lifesaver.