Burberry lightweight jacket

Burberry jacket size medium. 17” from pit to pit. 19” long in back. Size stated does not correspond with medium stated. Purchased it myself from another buyer and also did not realize the seam is tearing away from the middle back seam as the right back seam. Measure an inch. Also very tiny dot in back that is barely noticeable. I wear a small and it is snug on me. Sleeves are 3/4 length. Could easily repair seam. To me it would fit a x small.