What dress-shirt & dress-pants do you use in the Summer to keep cool in ALT jobs?

I went to Uniqlo today to buy some dress-shirts, they had some that were 100% cotton, and some that said "DRY". Online said that there should be AIRism kind but the staff said that was for under garments only.

If Uniqlo, which one do you prefer?

It not, please suggest me some 🙂

Thank you!