I got a question via PM about French seams. Here are some pictures of the whole process. The two mitered pieces are seamed together. I then turn over that assembly, spray some K-Grip foam glue on either side, and glue down the fabric folding it away from the center seam on each side. I then glue a piece of 1" twill tape over the whole seam on the back side. (BTW, let the glue dry thoroughly before you topstitch, or you can pull some glue through to the outside. It's not a big deal, but why have to clean off anything if you don't have to.) Then I turn the piece over and topstitch on both sides of the original center seam. You don't have to glue anything down if you can keep the seam open and hold the tape in place as you go, but that requires skills most beginners don't have. The factories use a special double needle sewing machine which opens up the seam and feeds the twill tape under the seam on the back side of the fabric. They then sew both sides at once while applying the twill tape automatically as they sew. That makes it a one step process for them. It's obviously a lot more involved with a single needle machine.
Last edited by DanTwoLakes; 04-11-2012 at 02:03 PM.