I used to deliver to a chemical plant that required long pants and eye protection. I just ordered pants 2 sizes to big- slipped them on over the workboots and shorts. My personal glasses worked for the eye protection.
I also delivered to a nuclear reservation. They had lots of strange rules, like no jumping from the dock into the back of a package car, you had to get out and walk around. Had to have a hard hat in car- just in case. So I was issued my own hat, with my name on it. Also got plenty of hearing protection, and a little booklet explaining color codes on ropes and barricades. Purple was a color to avoid.