I'm working on a queen size quilt and have a question on cutting the borders. I'm using the Robert Kaufman app to figure amount of fabric needed, but noticed that they show borders cut across the fabric. I thought there was a discussion about cutting border fabrics along the selvedge, rather than across, in order to have a nice flat "hang" to the quilt. Does it really matter? I'm eager to go the next step, but am concerned about how it will look when it's done. Should you go across for top and bottom, and along the length for sides?