Ah, here's the best shot of Azula and friends sans armor (http://dvdscreenshots.avatarspiritmedia.net/219/182.jpg) -- you can see that there's no neckband like on kimono or kimono-styled robes, and the sleeves are long but not very full. (More caps from that sequence are here (http://www.avatarspiritmedia.net/dvdscreens.php?ep=219&page=8). I have seen Suki/Kyoshi cosplayers just going for a more basic narrow-sleeved robe or kimono pattern, it's certainly close enough for cosplay, but going for something with a closer fit in the bodice like the chupa would have the advantage of less bulk to get in the way under the armor.
Since the underskirt doesn't really show much except at the hem and at the center front where the outer robe parts, you can probably just fake that however is easiest -- anything vaguely A-line with a couple of deep diagonal pleats at the right hip, you could just take a plain slightly flared skirt and then place another layer with a couple of pleats in it just across the front to fake that wrapped effect.
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timeasmymeasure
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Since the underskirt doesn't really show much except at the hem and at the center front where the outer robe parts, you can probably just fake that however is easiest -- anything vaguely A-line with a couple of deep diagonal pleats at the right hip, you could just take a plain slightly flared skirt and then place another layer with a couple of pleats in it just across the front to fake that wrapped effect.