A black long sleeve t-shirt and grey sweatpants are great menswear items to add to your off-duty fashion mix. For something more on the classier end to finish off this getup, complete this ensemble with a pair of black and white canvas low top sneakers. As the temperature dips, you'll find that an outfit like this is perfect for the season. And if we're talking casual fashion for adolescents, this combination is a good look on most men.