I know my measurements- they haven't changed since picking out dress shirts for Junior Prom, 7 years ago; 15 1/2, 32-33. This is a typical medium size.Instead I was sent a "medium" in 34-33, no neck measurements.There was way too much chest material and almost no 'tail' to tuck into your trousers, front or back.Although it's marked as Medium you should order a size down, apparently sizes must have changed in the last decade.