LAID FLAT IT MEASURES 19" ACROSS THE CHEST FROM UNDERARM TO UNDERARM AND 27" LONG FROM THE TOP OF THE SHOULDER TO THE BOTTOM HEM. THE SIZE TAG SAYS IT'S AN XL BUT IT FITS MORE LIKE A MEN'S MEDIUM BY TODAY'S STANDARDS. IT'S SINGLE STITCHED, MADE OF A 50/50 COTTON-POLYESTER BLEND, AND MADE IN THE USA. THIS IS UNWORN, UNWASHED DEADSTOCK VINTAGE FROM THE LATE 70s. THE SIZE TAG IS ACTUALLY NOT ATTACHED TO THE SHIRT - IT IS A PEEL AWAY STICKER THAT IS STILL ATTACHED TO THIS DAY!