A MUST HAVE WHITE SHIRT GREAT PIECE FOR EVERYDAY WEAR SUMMER LIGHTWEIGHT HIGH QUALITY FABRIC SUPER SOFT and CASUAL CHIC COLLAR BUTTON DOWN SLEEVE UP BUTTON Rayon Polyester blend Fine texturized fabric Light cooling fabric Matte silver buttons Modeling size S in cover shots SIZE S - BUST 19" pit to pit / Shoulder seam 16.5" across / Sleeve 23" long / Length 26.5" front. 27" back SIZE M - BUST 20" pit to pit / Shoulder seam 17.5" across / Sleeve 23" long / Length 26.5" front. 27" back SIZE L - add an inch from size M.