Oh, my! To each his own! I am currently using a 50# 3-ply cotton thread called Masterpiece. It's what I use to piece the quilt. It's very strong because its a 3-ply, 50# thread, and it's quite thin, as opposed to bulky. That makes it easier to hide. I use a single thread, and tiny, even stitches, which I take great care to hide as much as possible. Fussy, perhaps, but I do enjoy the handwork -- sometimes!