If you haven't read my "Torch posts not producing light" thread in the bugs forum, I'll go ahead and paraphrase myself:
Bandannas should be craftable using silk. You then can pour some sort of herbal extract onto them to stop the wearer from leaving scents for one hour (IRL) after the extract has been poured onto the bandanna. You must be wearing the bandanna for it's effects to work.
The herb required to produce the extract should be incredibly difficult to find, to stop potential abuse.
Don't get pissed if you think this is a bad idea. It's just a little musing I had whilst looking at the donation graphic.