This pairing of a white turtleneck and blue jeans embodies laid-back attitude and stylish comfort. To bring out the fun side of you, complete your ensemble with a pair of high top sneakers. During the winter months, when warmth is the priority, it can be easy to settle for a less-than-stylish ensemble in the name of functionality. This ensemble, however, is a good illustration that you can actually stay comfortable and remain equally stylish during the winter months. When it comes to casual fashion tips for 30-something guys, this look is a good look on most men.