Fits like a Large...
I bought this on Ebay...tried it on once...and it's just too big for me.  
I am 5'4 125 lbs. I'd say it's more like a large than a medium 

Excellent condition Ships to lower 48 U.S. 

The product is an authentic Majestic Detroit Tigers jersey in size M, (but it's definitely big for a M)
featuring a cool base design. This officially licensed MLB baseball jersey is perfect for male fans of the Detroit Tigers, with its iconic blue color representing the team. Made for baseball enthusiasts, this jersey combines quality and style for a comfortable and stylish look while showing support for the beloved team.