22.5" top to bottom 16" armpit to armpit but has a ton of stretch.
1976 77 70s VTG. Black Sabbath T-SHIRT Slayer Venom Anthrax Iron Maiden Dio Ozzy Osborn.
Sportswear polyester I have no idea of the size because the tag is gone but I'm guessing a Small or Medium definitely not Large. See above measurments.