Go for a straightforward but at the same time casual and cool choice teaming a harrington jacket and a white crew-neck t-shirt. Balance out this outfit with a more laid-back kind of footwear, such as this pair of athletic shoes. This getup is a pretty savvy option, especially for fall, when the temperature is dropping. Those wondering how to sport modern off-duty style as you work your way through your 20s, you have your answer.