If you have the patience to collect enough downfeathers (the really small ones), you measure the size of your bed: king, queen, etc. Add 6ins, make a large pillowcase, leaving approx 12in on oneside to stuff the feathers. After you have it stuffed, stitch your open area closed. The hard part is whether or not you want to hand quilt this to stablize it. You are making a duvet basically.