My "stash" grew so big it had to be stored in my closet as well as bins and a cabinet. It got to the point where I would be afraid to grab something from the mid section stash in the closet for fear of a fabric avalanche. And oh yes, it happened!
So I would go back to the quilt shop and buy the same, or close, fabric that I already had. That to me is the beginning stages of hoarding. So, I donated one large garbage bag full of fabric that I really knew I would not use in the next 10 years. It was hard at first but I'm more organized now with the huge pile I still have. LOL! But it's much better now.