For a laid-back and cool ensemble, marry a blue hoodie with grey sweatpants — these two pieces go nicely together. Complement this look with a pair of brown leather low top sneakers to completely switch up the outfit. Can you see how extremely easy it is to look seriously stylish and stay toasty when cooler days are here, all thanks to outfits like this? This combo illustrates how 20-year-old guys wow in the style department.