Go for a pared down yet casual and cool option in a blue denim jacket and a light blue long sleeve shirt. For a more casual finish, why not grab a pair of beige canvas high top sneakers? Undoubtedly, it's easier to work through a boiling hot hot weather afternoon in a easy and breezy combo like this. Think it's hard for over-40 gents to perfect cool casual dressing? This combination will prove you otherwise.