"Touma's new Subarmor"
This was surprisingly fun!
To my knowledge there is only one published piece of the new subarmor design and it's in the Message Art Book. I found that single image a few weeks ago and thought I'd give it a try. It's only a line art drawing, thus liberties have been taken with the colors based on the new armor designs. Below you'll find the reference image, feel free to snatch that.