I have a Stephen West pattern (Pogona) that asks for fingering wt yarn, 4 ply...what does that mean? I understand that fingering wt should yield 27-32 stitches/inch using U.S. needles size 1-3. The 4 ply is what is throwing me. Checking the yarn in my stash (that I would love to be able to use), the fingering wts are 2 ply. I am looking at Ella Rae Lace Marino, Prism Merino Mia, Koigu KPPPM, Caudia Hand Painted finger wt merino, and Shalimar Yarns Breathless. All are 2 ply when I untwist. Can someone please explain the 4 ply issue? Thank you all.