Try pairing a white long sleeve t-shirt with navy cargo pants for a casual look with a modern spin. Let your outfit coordination chops truly shine by complementing your look with high top sneakers. As the weather warms up, it's time to get rid of those bulky winter gear and opt for something lighter, like this outfit here. So as you can see, as a 40-year-old guy, you have a wide range of sartorial options.