I do quillows out of fleece for Project Linus. The pillow part consists of 2 layers of fleece with batting, all sewn envelope style and then topstitched. When that piece is sewn on to the blanket, it involves several layers, including the seam allowances. My vintage Pfaff 130 can do the job, but I have to go very slow at the corners where there are so many layers. The stitching is secure, but I can't brag about consistency of stitch length. I am just pleased that the machine handles it at all.
Dayle