My first thought would be to use something like Fray Check or Fray Block on the hole.
If you do decide to use it, test it on/in an inconspicuous place. It might dry stiff or discolor the fabric or dissolve the fabric.
I've used it to seal the edges of burn holes on my husband's shirts - one was wool and one was chamois cotton flannel.
Last edited by bearisgray; 04-27-2019 at 11:14 AM.