[That's a warning note in his tone, but Scully isn't sure why. What kind of issue with acid requires protective clothing when he doesn't know what acid it is? Is this some kind of weird mythological occurrence, something like Loki and the snake?

She eyes him uncertainly for a moment before giving up with a small shrug. He doesn't want her to ask, and she doesn't need to know.]

They make protective clothing out of these kinds of fibers already. You could buy a jacket and see if it works for her purposes first.