Well, I've been sewing all my life, but mostly with casual garments. I've made a lot of curtains/drapes, but I've never used an underbraider and did not recognize it when I read this thread. The gathering foot-I knew what it was, but likewise, I've never used it. I also recognized the edge stitching attachment, but have never used one, so it seems that I'm really uneducated with a lot of these attachments! Do you suppose 70 is too old to learn? Nah!
Jeanette