If you own an original wool shirt or pair of wool trousers, it's inevitable that they either already have had (or will at some point have) moths get to them and leave you with a hole - or many holes - to fix. How do you do that, so it looks like an authentic, period-correct repair? You DARN it, of course.  I'm sure you know how to do that, but in case you don't, here's a video to show you what to do...