Nike Halloween Sweatshirt Size?

Cut the tags out so I don't know or remember the size. Based on measurements I'd guess a medium, but please look at the measurements below and in the pics to make sure this garment works for you. Size: Unknown, maybe medium Brand: Nike Style: Halloween, Skeleton, Bats, Pumpkin, Swoosh Fiber Content: Unknown - Likely a cotton/polyester blend Color: Black with White and Orange Logo Vintage: Less than 5 years old Approx Measurements (laid flat): Pit to pit: 21" Length from back collar to bottom back hem: 26" Pit to cuff: 22"