Irrefutable proof that a navy sweater vest and navy skinny jeans look amazing when you team them together in an off-duty look. Introduce a pair of monks to the mix to easily boost the style factor of any ensemble. As the weather starts getting warmer, it's time to get rid of those heavy winter layers and opt for a look that's lighter, like this one here. Wondering how to nail casual style in your 40s? This pairing is the perfect answer.