A dress shirt and jeans combined together are a match made in heaven for guys who prefer laid-back ensembles. To inject an element of stylish effortlessness into this getup, add brown leather low top sneakers to the mix. During the winter months, when comfort is critical, it can be easy to surrender to a less-than-stylish getup. But this getup is a stark illustration that you totally can stay comfortable and remain equally stylish during the winter months. When it comes to casual style tips for 30-something gentlemen, this outfit is perfect.