Medieval Armor Sizes
This page shows several suits of European armor from the middle ages, average height is 6' solid:
http://www.artlex.com/ArtLex/a/armsarmor.html
This page shows several suits of Japanese armor. All the armor from before 1920 is below 5'6" in height. The armor from 1940 and since grows larger in size. The one complete set from the middle ages is 4'8".
http://www.jcollector.com/directory/...ord:Armor.html
My earlier remark about height was not meant to be a part of the fighter pilot thread. I know very little about zeros and the pilots who flew them. I do know something about Japanese literature, and I can say that the short stories and novels published during and early after WWII all spoke of the Americans as Giants.