LAID FLAT IT MEASURES 18" ACROSS THE CHEST FROM UNDERARM TO UNDERARM AND 27.5" LONG FROM THE TOP OF THE SHOULDER TO THE BOTTOM HEM. THE SIZE TAG SAYS IT'S A MEDIUM BUT IT FITS MORE LIKE AN ADULT SMALL 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!