you know how so many Clones have customized armor variations and paint in ROTS (to sell more toys obviously)... it seems to me that the first thing a trooper might do would be to remove an elbow or knee pad here or there. those knee pads look mighty uncomfortable.
you know kind of leading and influencing the design of Stormtrooper armor. so that could be an easier change. it just seems silly with all the modifications no trooper thought to remove those pads.