Banana Republic Blue on Blue Plaid XL Shirt

Lovely Blue on Blue Plaid XL Cotton shirt from Banana Republic. Size Tag missing Armpit to armpit = 26” which is the same as other XL shirts in my closet. There is a black spot inside under the Banana Republic logo at the bottom of the shirt see photo, it should not be noticeable even when the shirt is not tucked in, otherwise excellent used condition.