A cardigan and khaki jeans are among the key pieces in any modern gent's functional off-duty sartorial collection. To bring some extra flair to your getup, add brown leather brogue boots to your outfit. Keep this combination in your front hall wardrobe when spring sets it, and we promise you'll save a ton of time racking your brain for an ensemble on more than one morning. All in all, a great example of smart casual style for over-40 gents.