A charcoal wool turtleneck and charcoal wool dress pants are essential in a smart man's wardrobe. Introduce dark brown leather loafers to the mix and the whole ensemble will come together. A vivid example of transitional style, this outfit is a must-have when spring comes. As you move into your 30s, you probably want to start dressing in a dressier manner. If that's the case, ensembles like this are a goofproof option.