Our jersey sizing is unique in that it is graded individually per size. This means that we don't have the same increment jump between sizes, and some aspects of the jersey, such as length and sleeve, are adjusted independently versus the more conventional linear size increase across the board. Each of our jersey models is intended to fit the same in each size. Each fabric has a unique feel and elasticity, so the measurements required to facilitate that consistent fit aren't the same for each jersey we make. We highly recommend following our sizing chart or shopping at one of our retailers to find your preferred size and fit.