When I redid my will last year I designated my MQG to get all my sewing/quilting supplies. My kids know. My executor knows too.
I bought my LA from a woman who was downsizing. I have bought fabric and tools from other people who were downsizing. Plus I have bought a variety of fabrics and tools from thrift shops.
My plan for next summer is to do a major sort and purge. I will be moving my LA into a different room, redoing floors, painting etc. I hope to put in new lighting and more outlets too.
I have a friend who is much older than me, she has a beautiful sewing room, but also a basement full of stuff. I was talking to her a couple years ago and she admitted she does not know what all is in the basement. She has just found many packages of batting she had forgotten about. She has 5 kids and is leaving it up to them to deal with it all.