This smart casual combination of an olive parka and a black suit is very easy to throw together in seconds time, helping you look stylish and prepared for anything without spending too much time rummaging through your closet. For something more on the daring side to finish off this getup, complement your look with low top sneakers. This one is a savvy choice when it comes to putting together a well-coordinated outfit for awkward fall weather. Now that's how you do semi-casual as a guy in his forties.