TheLightwolf said:
In the comic realm Tony Stark Jr is 6'1" without the armor, and 6'6" with the armor...then again he is 225 lbs without the armor and 425 lbs with the armor on... But trying to gain 7 inches would be very unproportionate to your build. 3, maybe 4 inches you should be set. Also the suit will make you stand upright, while everyone else is slouching causing you to appear bigger as well.
So in my opinion the 2 inches you get from the boots, and extra 1-2 from the helmet should suffice...