This is irrefutable proof that a grey fleece sweatshirt and navy jeans look awesome when you pair them together in an off-duty getup. Let your styling skills really shine by complementing your look with a pair of navy slip-on sneakers. So as you can see, this getup is a really savvy pick, especially for unpredictable fall weather, when the temperature is starting to drop. Those who wonder how to stay stylish as you move into your 40s, you have your answer.