Calvin Klein sleeveless sweater- pale blue- size L ??

This pale blue Calvin Klein sweater vest is sure to accent any outfit. Not sure of size, but think it is a large. Pit to pit measurement is 19 inches. From front collar to bottom hem line is 18.5”. Across the abdomen area is 20”. While inspecting, I noticed a very small snag on the back of the sweater. Please see pics.