Most shrinkage actually comes from batting and density of quilting in most quilts unless using cheap fabrics. I have quilts that were not prewashed that aren't really that crinkly. I still have never quite gotten into prewashing quilting fabrics. I just recently wash tons of muslin for embroidery and found it very tedious and it drove me about nuts with the prep and ironing/starching post wash and dry. Thats the one qualm I have with embroidery is the prewashing to avoid puckers. I even washed really nice flannel to find out hardly any shrinkage and that I had really wasted the extra time. I have been trying to understand the washing thing for 15 years