If you'd like take your casual game to a new height, wear a denim jacket and a crew-neck sweater. Bring a laid-back vibe to this look by rocking a pair of navy and white athletic shoes. You see here this combo is also a practical illustration of dressing stylish in the winter months. In your 30s, you probably want to start dressing more like a mature gentleman. In this case, ensembles like this are a real life saver.