Originally Posted by CoryB
I'm not certain, but I believe all shirts of this type have two button holes to vary the tightness of the cuff. When the cuff is tighten it should come up to the smaller number (because it encounters your wrist) and when in the looser position it is the larger number.
I think the two buttons and the multiple lengths are unconnected, although related in the sense that both are intended to make the shirt (at least apparently) more flexible in terms of fit.
I've never bothered to measure the length of a 32-33 or 34-35 shirt, so I don't know the answer, but I suspect that the shirt is in fact the longer length or close to it. Think about which is more discomfitting--having an extra inch of sleeve, or being short an inch? I'd take a shirt an inch long over one an inch short any day.