Here I have a pre owned Vintage Pittsburgh Steelers Three Rivers Stadium 1970-2000 T Shirt Size Large in Gray.   Two small spots please see photos,  one on the front side and one on the back.  I will ship it with USPS.  I can't read the size so I will provide measurements.

Armpit to Armpit is 23 inches,  sleeves 8 inches and total length is 26 1/2 inches.