The subject came up this weekend, "How does a fencer gain full range of motion, without restrictions or binding?"
My first suggestion is to make the arms eye as small as possible and shift it slightly forward, giving more fabric on the back. Making sure that the shoulder ends at the point of the shoulder will also give a more full range of motion.
The shirt underneath can also cause binding, especially if the sleeve is "extra billowy" or has a large arms eye.
Lastly the modification to the sleeve cut will give just a couple of inches when reaching forward for a lunge or long point.