I think they could show Harada early in the movie doing a business deal and walking around his palacios home that has a room containing the classic suit of armor in a glass cabinet, and he explains to the person he is doing business with that it's has a mythology behind it.
Originally Posted by Duke
He definitely needs to have his helmet, but they might alter a little, much like they did with Thor, minus the helmet for most of the movie.
They could use a tapered in version like the one shown below.
This wouldn't be a bad way to end the final battle either.