Sorry I'm posting a bit later than usual, the holiday threw me off. But at least I have something to share.
I was given a very nice vintage Stetson Fedora to resell on Ebay. But the covering for the stay had torn from age. So I repaired it by whip stitching very close to hold it all in place.
I think it looks fairly good and its not seen when being worn. It was worth doing as the hat is priced at $50 with the repair photo and noted. Every other part of the hat was in excellent condition.