Use your wife/girlfriend's washed underwear - she won't mind. Trust me.
Ok, I've got plenty of cut-up t-shirts and cotton underwear (mine, since wife/girlfriend is probably not happening in this lifetime).
T-shirts, old pillowcases, bedsheets, boxer shorts. I cut up all that stuff. The fabric is usually pretty well worn and soft by then. I don't worry about damaging anything.
Ok, I've got plenty of cut-up t-shirts and cotton underwear (mine, since wife/girlfriend is probably not happening in this lifetime).
Those patch things are some sort of fibrous papery stuff, at least the ones I have. They're not really cloth. They seem too skimpy to do any good anyway.
You could also just go with a bore snake.