Peony

Helm: The Helm is complicated and something I've always envisioned as being constructed of a mesh of leather/metal, with a screen for her to look through. You're allowed freedom to make it work.

Overall: The armor itself is really tight-fitting, so it accentuates how small, lithe, and tiny she really is. She doesn't really have a bust, practically flat as a board. Her armor has a few metallic plates in places, particularly the shoulders, chest, anywhere that doesn't need flexibility really.

In short, it's nothing bulky. All of it is tight fitting and pretty damn air locked in order to prevent her from burning herself.

Also it can set on fire, if you want to bother with that detail.