You're looking at the hard proof that a charcoal crew-neck sweater and navy vertical striped chinos are amazing when teamed together in an off-duty outfit. For something more on the smart side to finish off your outfit, introduce a pair of dark brown leather casual boots to the equation. In winter, when comfort is top priority, it can be easy to settle for a less-than-stylish look. However, this look is a vivid example that you totally can stay snug and remain equally stylish in winter. Now that's how you keep it casual in the fashion department in your forties.