I think I know what you mean by pick up the stitches. The pattern says to sew up the sides 12 inches and you are suppose to have the total length 19" I want it longer so I plan to go 22". How do I know if I have the arm hole big enough? So I would sew it up the extra four and try it on and check?
Do I decreasing one stitch on each side every 5 or 6 rows????