I researched it and it looks like it does not make any sense to drop in quality that much. I had read about the possibility about using Joanne's (or other domestic fabric stores) from a post on another forum somewhere. Nobody had actually done it but someone suggested it. Considering I will not approximately 1-1.5 inches of insulation, that is too many layers of crappy stuff to make sense.
Regarding using reclaimed down from thrift store... DON'T DO IT!!! I have personal experience with this one. Its much less down and more fluffy, very small feathers that will constantly come out of the bag and you will wake up covered in tiny feathers.