I asked the question a while back. I’ve misplaced the answers. Some were akin to "make a quilt." I’ve given some shirts over to rags n the garage. I hate the idea of simply adding the shirts to the trash. I don’t think any donation service like Goodwill or Ladies of Charity would actually take these. I think they can be added to compost but I’m not composting at the time.
So, what can I do with 300 tee shirts that date back to the 80s?