Every so often I try to go thru fabric and drawers to try and get rid of stuff I hang on to that I know I don't need. But I only purge things I want to get rid of and am not concerned with what my family will do when I'm gone.
Your donations will help others. My niece had a friend that took a large amount of fabric to Haiti several years ago. They made clothes and they taught people how to sew. Thrift stores look to use items before they get rid of anything.