I have some old t-shirts I bought while overseas that have a lot of sentimental value to me, but over time the embroidery on the front has begun to fray and even to come unravelled. It is simple threaded embroidery done by a machine, but I love the shirts and I would love to protect them. Is there a way I can repair them, or at the very least keep the pattern from unravelling further? There was backing on them at some point, but it has long since washed away. And I always wash these shirts inside-out, and only as needed. But I still need a way to keep the embroidery from absolutely disintegrating, if possible! Please help! Thanks in advance, R