My guild had a lady today who backs all her quilts in denim. She said the main thing to watch out for is the weight of the fabric. I think she said use under 10 oz.---(I may be wrong, on oz. I know someone has mummy for weight--guess I am confused about the 2) Anyway her favorite is to use the brushed denim. She wanted the strong, drag around backing for her son--but honestly she makes quilts with zillions of pieces--I can't imagine dragging any of them around!