If you like casual outfits, why not take this combination of a light blue denim jacket and navy chinos for a walk? On the shoe front, go for something on the laid-back end of the spectrum and round off your ensemble with a pair of white canvas low top sneakers. You can bet this getup is great when cooler weather hits. Casual outfits for 20-year-old men aren't actually that hard, as you can see.