Since I am studying European history, I do not underestimate the etymology approach.
Talking about Japanese armor, we in the west are cursed because of the language issue. On the other hand, we are blessed: We are forced to analyse what we see, not to absorb what we read.
i have experienced many times that we understand things better than some Japanese, simply because we are forced to use our eyes. If you do archeological reconstruction, it must even give a better idea.
please continue Artur, the floor is yours.