This relaxed casual combination of a black turtleneck and charcoal jeans is capable of taking on different forms according to the way you style it out. To give your look a dressier feel, why not introduce a pair of tobacco leather chelsea boots to your look? You can see this ensemble is also a great illustration of how to style warm clothes in the dead of winter. A safe bet for 20-year-old guys in search of a more professional look.