Calvin Klein Black and White Button Down Shirt Size M

Calvin Klein black and white checked button-down shirt. Great w jeans, leggings, work pants or skirt. I have no idea why the tag is missing, but I am a true medium, so this shirt must be. I go by measurements on these postings anyway, due to how washing and laundering can affect length and measurements, so this top is roughly 20" ptp, 30" long, when laying flat. No stains or tears. Pet and smoke free home.