Okay, could you explain this please?

the disadvantage is you'd have to graft the sleeves on, and the armscyes are curved; looking at the girls without the armor, their robes definitely have the straight-line sleeves and shoulder seams of a basic kimono, even if the neckline is a little funky

And I like the idea of doing spliting the costume up and doing the top + 2 skirts - that might be a way to break it down and simplify it. *ponders*