This combination of a turtleneck and blue jeans is hard proof that a safe off-duty getup doesn't have to be boring. Wondering how to round off? Complement this ensemble with dark green high top sneakers to mix things up a bit. As the weather starts to cool down, you'll discover that an ensemble like this is ideal for the season. This combination proves that as a 20-year-old man, you have a wide range of outfit options.