Loving the way this pairing of a dark brown blazer and a dark brown waistcoat instantly makes any gent look sharp and polished. A good pair of dark brown leather tassel loafers ties this getup together. Dressing smartly is the key to surviving below-freezing temperatures, but this outfit is a good illustration that you can do it with style. No doubt, a nice option if we're talking outfit ideas for 40-year-old men.