Leeza asked for tips on clipping/notching when you need to under-stitch. There is a trick that allows the curve to lay flat and look beautiful from the right side. After you grade the seam and are ready to clip, the trick is in how you clip. Instead of clipping both layers at once and at a 90 degree angle to the sewn seam, clip each layer separately at about a 45 degree angle. One layer will be clipped to the left at a 45 degree angle, the other layer will be clipped to the right at a 45 degree angle. Then under-stitch as usual. You will be pleasantly surprised at how beautiful it lays. And there won't be any notches visible through the layers on the right side.