I’m altering a prom dress, and need some advice. The center back has been lowered, producing a “bias” seam from the side under arm area(outer edge of halter bodice) to the center back. Aside from interfacing, what else can I do to prevent the fabric edge from gapping? I cut a facing on-grain to prevent the fabric from stretching on the bias, but wonder if it’s the best strategy?
Kristine in Michigan