The problem that I have with all dress shirts is the flaring in the back. I can tuck the shirt in to look all nice but once I sit down the shirt becomes baggy and would look so sloppy. I get up quite frequently from my desk at work so it is constant. There's nothing wrong with the shirts fit, the overall fit is very good but its just the bagginess in the lower back that annoys me. Is there anything I can do to minimize this and secondly what causes the excess bagginess? Can I easily get the shirt altered to fix the problem or would that require allot of work?