Cowboy jeans, and military style pants and shorts, like fatiques, with all the pockets, sometimes called a jumpers pants, made from cotton. With all cotton pocket tee shirts. Great place to carry your phone, with combat boots. Don't forget a belt..tuck in the shirt soldier, and you have your swag.
Well, I don't know much about you to guess what kind of things would look good... If that even makes sense... Well what I find nice looking on a guy is fitting jeans... They don't have to be skinny jeans. And a plain white t with a light hoodie or jacket over it. And maybe converse shoes or even hightops that match the hoodie. But if it's too warm to wear hoodies you can wear a thing button-up flannel print shirt with any kind of pants (jeans or shorts) and any shoe that would match the shirt. So yeah hope this helped any!
You could wear a collard shirt with a small tie and hat if you want that might look ok with some regular jeans and just whatever shoes feel comfortable. :)