Warm Coat, Runs Small

I am 5'1" & ordered the Small in this coat. It fits, even the sleeve length. My usual size in coats is a 6p - 8p, so you can get an idea of how this coat runs in size. It's a heavy coat & warm. It fits me so closely that I don't think I could wear a sweater underneath. My chest is 36.5", & I am small-framed with narrow shoulders. Bloomingdale's delivered the coat in 2 days for free! This coat was sold out in other stores, but Bloomingdale's had my size in stock. Yaay!