We are not apparel sewing and straight of grain isn't the issue in quilting that it is in clothing. I wash the fabric, press it without creases it, shake it and let the top edge fall where it will so that the selvages are even and there are no wrinkles. I rarely lose more than 1/2". Fabric is wound on the bolts while damp and not always straight. Washing and drying helps remediate that twisting. You won't get a salesperson to tear any fabric except fake fur, at least not at JoAnn's in the 90s when I worked there.