Such items as a navy and white long sleeve t-shirt and black sweatpants are the ideal way to infuse toned down dapperness into your daily styling arsenal. Hesitant about how to finish your getup? Round off with a pair of low top sneakers to up the style factor. As you can see, it's very easy to look dapper and stay snug come cooler weather, all thanks to outfits like this one. This combination illustrates how to keep killing in casual dressing as a man in his 30s.