I've been researching for a while on this subject, but I can't find a specific rule; albeit I suspect there must be something (if it does, sure you boys know). The thing is that I own a sport coat which fits me really fine, but I'd be utterly happy if I could make it be just a little bit more taylored at the torso (when buttoned, I mean). I thought I could just move buttons 3/4 (inches) to the right (from 3/4 to 1 1/2). I've already moved the middle button just to try and the fit is perfect that way. Am I breaking any rule? The sport coat is rather "casual" (sort of moderate saharan jacket). Thank you very much.