For a look that's pared-down but can be styled in a multitude of different ways, consider wearing a white crew-neck t-shirt and khaki chinos. Introduce white leather low top sneakers to your outfit and the whole outfit will come together perfectly. During the winter months, when warmth is essential, it can be easy to surrender to a less-than-stylish look in the name of practicality. This look, however, is a vivid example that you totally can stay cozy and remain equally stylish during the winter months. When it comes to casual style tips for gents in their 40s, this ensemble is perfect.