Oh wow, I have definite fabric stash envy! And a lot of empathy for your storage predicament. Have you considered trouser hangers for the off-bolt stuff, and maybe several of those cascading hangers to keep types together?
Considering the amount of space the boxes must take up, I'm wondering if wardrobes (armoire) wouldn't be a good way to organize, too-the bolts could be stored upright inside a wardrobe right along with the loose fabric you've organized on hangers, and it would probably take up much less room than the boxes. Depending on how big your stash is you could have a wardrobe for each type of fabric you have.
You could hit the yard sales and thrift shops for a wardrobe, or you can buy fabric/vinyl ones at big-box stores. A wood wardrobe here in the UK can be found for as small an amount as £5 in the charity shops (lol, just found one last week, and it turned out to be a 1930s Art Deco), the last time I was in the States I saw a really lovely one at a yard sale for $10.
I am using my £5 wardrobe for my clothes, but I think I'll go looking for another to use for my fabric stash-I think I'd feel very chic with my fabric stash peeping out from an open wardrobe:)
Seperate all material for instance all calico in one pile and so on. Once you got it sorted if you have closet space use the space bags for cut fabrics or hang them on hangers. There is a garment bag that is oblong and square. Use that to cover the hangers with the cut fabric. Then store the bolts in that as well. Keeps bugs, dust off your materials! Hang it all in the closet.
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