Pairing a navy turtleneck and navy jeans will cement your skills in men's fashion even on weekend days. A pair of brown leather derby shoes will put a smarter spin on this getup. Keep this combination in your front hall wardrobe come warmer weather, and we promise you'll save a lot of time getting dressed on more than one occasion. As you reach your 30s, you probably want to start dressing more maturely. If that's the case, inspo like this is very useful.