LAID FLAT IT MEASURES 18" 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 A MEDIUM BUT IT FITS LIKE A SMALL. IT'S DEADSTOCK, UNWORN, UNWASHED VINTAGE. I HAVE A FEW MORE OF THESE SO IF YOU'RE INTERESTED, PLEASE MESSAGE ME.