I thnk it becomes hording when you can't push yourself to cut your fabric. I don't have that problem and love when I can use what I have!
So I'm no where near hording on fabric - now vintage sewing machine . . . that may be hoarding - don't use them but can't part with them. The other day I walked out to my car at work - and there was a case on the ground next to my front door. Really nice little National machine. Hmmm- it's still in the back of my car.