The vertical ribbed pattern allows for size flexibility. If the sweater is left to fall softly, it will expand between the ribs to fit a range within a size. So, for instance, size 34-36 measures between 37 and 40 inches, depending on how much it is opened out. But, even the 40 inch width doesn’t stretch it too far and spoil its looks.
This sweater uses smaller than usual needles for this yarn. This produces a garment which will hold its shape. A Mari Sweater fits and it flatters.