The Mountain t-shirt

A little confused on the sizing of this shirt. My sister is an adult medium & she would wear this shirt. It says XL, but I'm an XL and there is no way this would fit me. Might be for youth? Anyway I'm listing as a medium since my sister wore it. Reposhing this item I purchased from @placeoffers247. Loved it, but ready to rotate for something new. Questions? Leave a comment below!

• Seller is 5'4", 150lbs, 32C