For a look that's super easy but can be styled in a variety of different ways, go for a brown blazer and blue jeans. To bring some extra definition to this look, complement your getup with a pair of dark brown leather tassel loafers. As the weather starts to cool down, you'll find that an outfit like this is ideal for the season. As you see, as a man in his forties, you have a wide range of dressing options.