For an ensemble that's pared-down but can be styled in a myriad of different ways, wear a charcoal crew-neck t-shirt with sweatpants. Our favorite of a great number of ways to complete this outfit is with a pair of grey athletic shoes. This combination is a stark illustration you can still be fashionable while bundled up. Those who wonder how to rock modern off-duty style in your 20s, you have your answer.