For an outfit that's super easy but can be modified in a great deal of different ways, reach for a black parka and navy jeans. Add a smarter twist to this outfit by rocking dark brown suede casual boots. During the winter season, when warmth is key, it can be easy to settle for a less-than-stylish look in the name of functionality. But this look proves that you totally can stay snug and remain equally stylish in the winter season. Wondering how to nail casual outfits as you head into your 40s? This combo is the perfect answer.