In 40-degree weather, prioritize warmth and comfort. Wear closed-toed shoes (like sneakers or boots), thicker socks (wool or cotton), and consider knee-high socks with rain boots if raining. Dress in layers, including a long-sleeve shirt. Choose a light jacket or coat for outerwear, and layer with a fleece jacket or vest when it gets colder. Have a waterproof rain jacket or shell handy. Don't forget gloves for warm hands. Stay cozy and comfortable in 40-degree weather by following these clothing tips.