This combination of a navy trenchcoat and a white long sleeve shirt is the perfect base for an outfit. And if you wish to easily play down this ensemble with footwear, why not complement your ensemble with a pair of charcoal athletic shoes? If it's one of those gloomy fall afternoons, what better to cheer it up than a stylish outfit like this one? This pairing should clear any doubts you had about dressing casually as a man in his 40s.