I made wool bed coverings for my family (7 children) years back from wool from our sheep. After cleaning the wool, and carding into batts on my drum carder, I laid the batts between two layers
of very light muslin type cloth sold for this purpose. Then with yarn needle and yarn, I hand sewed the batts with long running stitches, between the fabric in a grid of sorts...kind of like making a large flat pillow. Now I sewed together 2 flat sheets on three sides, making a giant pillow case for the batt to slide into. The cover was easily removed and washed...and the batts lasted for over 20 years.