After I have finished the quilting, I trim the top, bottom, and batting the same size, then add the binding. When the binding wraps around the edge, it covers it without adding to the size of the quilt, so the batting still goes out to the edge, but does not fold over into the binding. If I use the bottom liner as the binding, I just leave it longer, and still cut the batting the size of the top, then fold the lining over to the front and hem.