REMAIN Womens' Blue V-Neck Sweater Size Small?

This is a great v-neck sweater by Remain. This is light blue and ribbed, it is a size Small?, and it is in very good condition. There is no size listed so here are the measurements: armpit to armpit measures 15 3/4 inches; the length from the top of the shoulder to the bottom hem measures 24 1/2 inches.