For a tested casual option, you can rely on this pairing of a henley shirt and navy jeans. Feel somewhat uninspired with this look? Enter brown boat shoes to change things up a bit. If you're often not sure how to dress as a 20-year-old man, this outfit is a safe bet.
For an outfit that's pared-down but can be flaunted in a great deal of different ways, team a henley shirt with navy shorts. Add brown boat shoes to the mix to avoid looking too casual. A safe bet getup appropriate for 20-somethings who prefer casual dressing.