Teaming a black suit with a charcoal turtleneck is a good idea for a casually neat outfit. Complement your ensemble with a pair of black leather tassel loafers et voila, the look is complete. You can bet this combo will become your uniform when spring comes. As a guy in his 30s, you probably want to start dressing in a dressier manner. If that's the case, inspiration like this is very useful.