NEW MEN'S SEX PISTOLS SHIRT COTTON  LONG SLEEVE BUTTON-UP   SIZE MARKED -S    BUT - UNDERARM TO UNDERARM-  (CHEST) APPROX. APPROX. 21 INCHES,  AND 29 INCHES LONG FROM MIDDLE SHOULDER.  I SEE SIZE CHART CHEST 21 INCHES -MEDIUM  OR EVEN LARGE ?   SHIRT NEW WITH ROUND TAG FROM PRIVATE COLLECTION.  THANK YOU  FOR LOOKING