The Atlantic clam no sew jumper is made as it says, with no sewing together of any part, with exception of weaving in the ends. It’s made from cuff to cuff in one piece, joined seams as you go. There are charts, written stitch details and video links to guide you through all processes. there is a diagram of neckline choices, but the split collar is detailed. It fits all sizes from Connie my Gremlin to the tallest Wookie. the measurements’ guide will explain how to work out the sizes you are working too.