A navy and green plaid blazer and blue jeans are a combination that every style-conscious gent should have in his casual wardrobe. You could perhaps get a little creative in the shoe department and polish up this ensemble by sporting a pair of brown suede derby shoes. As you can see here, this ensemble is a really smart choice, especially for awkward fall weather, when the temperatures are dipping. Surely a smart idea if we're talking fashion for men over 40.