For a casually dapper getup, try teaming a black crew-neck t-shirt with black ripped skinny jeans — these two items fit beautifully together. Complement your ensemble with yellow athletic shoes et voila, this outfit is complete. As warmer days set in, it's time for light and breezy combinations like this one. If you're often not sure how to dress as a 20-year-old, this outfit is a never-failing option.