I cut my pillow top the same size as the form, no added seam allowances. I was shown that "curved" method years ago and have always winged it, nice to know someone thought up a template! I don't need it, but proves the theory out, the "dog ears" go away with that curved method. I find it especially useful when cording the edges. I always make the envelope back, easy to take the cover off to wash or change out. Also makes it easy to adjust the seams if need be without taking the whole thing apart. My pillows always please me! That's what counts, right?