Yep learned how to do a flat felled seam in Home Ec and 4-H over 60 years ago. They have just given it a fancy name, but it is the same thing. We had to measure every inch of that darned seam in Home Ec to be sure it was all even etc., and then sew it down. Didn't have the hemstitching item then, we learned to do it the hard way. Doubt if the younger ones have even heard of it the way they teach Home Ec or whatever they call it now.