To don a casual look with a modern spin, you can easily go for a navy denim jacket and an olive turtleneck.
Olive Turtleneck with Navy Denim Jacket Cold Weather Outfits For Men
You'll be surprised at how extremely easy it is for any man to get dressed like this. Just a navy denim jacket married with an olive turtleneck. Show off your refined side by finishing off with black leather chelsea boots.