I remember well the weight of quilts when visiting my grandparents. Some winters I slept under 4-5 quilts. They were batted with cotton, most of the time the quilter made the batting as well. I can't remember hearing anyone talk about how they made them. Have any of you. I suspect the other materials were heavier as well.
You might get the 'feel' you are looking by using two battings or I believe there are heavier ones available.