Try teaming a light blue long sleeve shirt with black chinos for a laid-back and cool and fashionable look. Introduce navy canvas low top sneakers to your ensemble to immediately bump up the wow factor of your ensemble. So if it's an extremely hot afternoon and you want to look seriously stylish without putting in too much work, this look will do the job in seconds time. Casual outfits for stylish 20-year-olds aren't actually that hard, as you can see here.