I have been thinking this over, and now I'm not even sure if I can do mattress st on the pieces. Since they were knit on the diagonal, when put side by side to sew, the sts are all on the diagonal. Is it even possible to do mattress st and have it turn out correctly? I must make time for swatches and check this out. Has anyone ever done pieces on the diagonal, then tried to sew together as a square? I am so confused
Thanks for any advice!