Reebok 69421 blue polo style sport shirt US size M fits like a Small EUC

Reebok 69421 blue polo style sport shirt US size M EUC The third picture with the tag shows the color of the shirt the best. Important: Please see photos for measurements. I feel like this shirt runs very small for a medium. I purchased it online, but never wore it because it was too small for me since I wear a true medium.