First stop it from unravelling more. On small holes use fabric store no fray on it. Reweaving is a possibility if you can scavenge enough threds to fill in the hole, They make a tiny hook to pull the threads through. Sometimes it makes the repair even more visible. I have been know to do a down and dirty bit of repair using a small piece of matching fabric with a little stitch witchery and just heat fuse the hole works together. I've done this on one old tweed jacket that a moth put a 1mm hole and and it is invisible. I also did it on the under apron of a kilt I made that the fabric had a couple small moth holes. They were where no one could see them and I just matched the fabric underneath. O'Neille