If you like casual style, why not marry a crew-neck sweater with sweatpants? Rounding off with a pair of grey athletic shoes is a guaranteed way to add a more laid-back vibe to this getup. So if you're scouting for an outfit that's stylish but also feels entirely season-appropriate, this one is great. This outfit shows that as a gentleman in his 20s, you have a vast array of outfit options.