The problem is, Xion also has armor. Granted, it's possible it may not be the same as Xemnas', but I doubt it.
not armor. its either her "nobody" form, sorta like a dusk would be, after she went ballistik, or her new bodies true form. also, it didnt really een look like armor. more like a nobody in the first form, then sora, then kurt zisa, then sora in alor form.