Nah, that's not horrible, the absolute fast-and-dirtiest way of doing that would be to just go with a basic kimono-styled robe pattern, wrap it really tight above the waist, but then sort of pull it apart in the front below the waist, and count on the flare of the underskirt and the armor and sash holding everything in place. Totally doable and good enough for cosplay, I'm pretty sure that's more or less how a few of the ones I've seen in the past were done. Or you could take the basic robe pattern, which probably is cut very straight like a classic kimono, but chop it off at the waist, and then cut out the bottom half separately so that it flares out a bit more from the waist on down, and is cut away a bit in the front so it doesn't overlap as much as the bodice; again, the armor will cover up the seams. The slight advantage of the chupa is it's already got a waist seam, so you'd just need to slit the skirt open in the front and bring the side panels around to tie in front instead of the back, but 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.
If I were doing it I'd probably mostly construct it mostly like a kimono, but I'd eliminate the neck binding, draw the upper edges of the neckline up a bit higher to compensate and finish it all with a facing; put in darts at the waist to eliminate a little bulk, and cut the lower half separately so it would be a little more flared and not overlapping at the center front like the bodice does. Hell, if you're not planning on running around without your armor and aren't a stickler for authenticity, you could just even treat them as two separate pieces -- do a wraparound top, and then make an A-line skirt in two layers; by the time the armor and sash are on, nobody will be able to tell the overskirt and bodice aren't actually attached at the waist.
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timeasmymeasure
no subject
If I were doing it I'd probably mostly construct it mostly like a kimono, but I'd eliminate the neck binding, draw the upper edges of the neckline up a bit higher to compensate and finish it all with a facing; put in darts at the waist to eliminate a little bulk, and cut the lower half separately so it would be a little more flared and not overlapping at the center front like the bodice does. Hell, if you're not planning on running around without your armor and aren't a stickler for authenticity, you could just even treat them as two separate pieces -- do a wraparound top, and then make an A-line skirt in two layers; by the time the armor and sash are on, nobody will be able to tell the overskirt and bodice aren't actually attached at the waist.