I have a real stumper here (for me). I just bought a great jacket for “reference material”; it is made of a fabric that looks like layers of thread quilted in place. The lining is cotton tulle. I’m looking over this lining, and I cannot for the life of me figure out how they bagged this thing….there is no handwork visible anywere, all the seams are interior….it looks like it was sewn with a machine from the innards of the thing and the machine went “poof” and disappeared. There is, again, no place I can find where this could have been turned. Any ideas how this was done?