For a casually dapper ensemble, go for a short sleeve shirt and olive shorts — these pieces work pretty good together. For something more on the classy side to complete this look, complement this outfit with a pair of tobacco casual boots. Stick with this one if you're looking for a solid summery ensemble. If you're not sure how to dress as a 20-year-old guy, this combo is a practical example.
Make a short sleeve shirt and black shorts your outfit choice to pull together an interesting and modern-looking relaxed casual outfit. Complement your look with a pair of tobacco casual boots to instantly ramp up the style factor of this look. You're sure to always look cool even despite the unbearable heat if you have this outfit as a last-minute grab. Gentlemen who wonder how to dress fashionably as you go through your 20s, you have your answer.