I googled 8 oz. flannel fabric and discovered that it IS still made....for drapery lining! Who knew! Or I could just buy flat sheets, it comes in sheets in that weight, too, as some of you found. Years ago I bought a flannel "mattress pad" from Land's End (I thought) and it is even heavier. I often use it as a bottom sheet in the winter.
But, I still want a shop where it comes in colors by the yard.......
Jan in VA