I was a grad student who worked in a fab. I found that after a couple of years wearing that bunny suit, mask, and rubber gloves for 6-8 hours per day (or, more likely, per night) I was completely used to it.

I used to catch myself surfing the web in the clean room after hours. "Wait!" I would say to myself, "I could be doing this outside the clean room, where I could take off this silly suit!"

But they are stressful places to work. The noise is quite troublesome and the ergonomics are generally awful.