A long sleeve t-shirt and a grey crew-neck t-shirt are a smart combo to rock a version of on lazy days. To add some extra depth to this ensemble, introduce a pair of beige leather casual boots to this look. Rest assured, this combination will keep you toasty as well as looking stylish in this unpredictable fall weather. Gents who wonder how to wear modern off-duty style as you head into your 30s, you have your answer.