From the magazine:
“The undulating lines of a vertical drop-stitch rib are remarkably elastic, making it possible to wear this sweater upside down, right-side up, and even inside out.”

For the two smallest sizes, the garment can be worn two ways: with the cowl-neck worn as the collar, or upside down so the cowl-neck becomes the lower body and the “body” becomes a dramatic foldover collar.