The pattern contains notes on adjusting the size but does not give explicit instructions for any other size.

From the magazine:

Comfortable like a t-shirt yet chic enough to wear with both jeans and fancier attire, this vertical-striped pullover is perfect for traveling, when a flexible wardrobe is key. It is knit in four colors of nylon ribbon from side to side from the center out in two pieces of stockinette stitch and reverse stockinette stitch, which creates a subtle ribbed effect (adding elasticity and body). Two strands of yarn are run together throughout the entire garment, first two strands of the same color, then one strand each of the first color and a new color, then the new color alone, a technique that flows one color into the next without a sharp or jarring transition.