So, with 25 energy of Charred Patch and 50 energy of Patched Pants active, I tried using my pants. I lost all energy of both effects, and got this:
You tear at your pants, saving anything that looks like it might come in handy.
You found: tough cloth
So, it looks like it's possible to recover at least some of the stuff you use on your pants. Can you only get one? Does it depend on how much energy of an effect you have left? Is it random? So much to find out!