Such pieces as a long sleeve shirt and black shorts are the ideal way to infuse effortless cool into your off-duty fashion mix. When not sure as to the footwear, stick to a pair of black and white canvas low top sneakers. So as you can see, this look is a really great choice, especially for awkward fall weather, when the temperature is dipping. Ideal for a 20-year-old guy if you want to present a laid-back image.