Not a quilting question but a sewing one. DH has grown a belly over the years, and his dress shirts are all tight. Some to the point they don't even button up. I plan to try to open the seams from the bottom up to about 6" below the armhole, take the shirt tail off the back of the shirt and use it to make a gusset for each side, but don't know how to shape the gusset. Probably it would be an elongated triangle. I'd only need about an inch on each side. Has anyone had to do this? Is there a better way? Hope someone can guide me.