Banana republic olive 100% lambswool sweater size large

Banana Republic brand olive color size large ( seems to be smaller) 100% lambswool V neck ribbed sweater such a great quality piece. It is running small so please see mesaurements. we havent tried to restretch it as we didn not want to ruin it, it may just need to be reformed Measurements laying flat: 19 inches pit to pit and 2 inches shoulder to hem and 19.5 arm length