Like most professionals I invariably come in to work in formals or semi-formals. And I always have one complaint- that simple, high-quality, perfect-fit shirts that we could wear to work were surprisingly hard to find. The high-end shirts are overpriced and over designed. The simpler and cheap one are not up to the mark. Fitting is the most important factor to make you look sharp and feel comfortable. Most of the off-the-rack shirts doesn't fits perfect. Some creates balloon around your waist and make you look like muffin top. Some have excess fabric billowing out from your back which is catching wind and you will look like a parachute. If you select a shirt which fits perfect on your shoulder and belly then you will find problem with shirt length and sleeve length and then you have to tuck your shirt almost 15 to 20 times a day. In short there are almost 9 different body measurements required to construct a perfect shirt and standard sizes can't perfect all of them.