Aztec Costumes

We were delighted when my son announced that the Aztecs are his school history topic this term. At last! Some homework I can help him with! But our joy turned to gloom when he brought a piece of paper home with him. "School History Day": each class will dress up as people from their historical period for this term...
My wife fixed a baleful eye on me. "So what," she demanded, "did Aztecs wear?"
"Um... skirts and shifts for the girls, and the boys... a breechcloth and a short cloak, mostly."
"I am not sending him to school in a breechcloth!" I could see her point. It might have been worse, mind you: my son's nine, but if he'd been six, he'd get a scrap of cloth to wear over his shoulders and no underwear at all. I thought about it a bit further and suggested a warrior costume. This proved to be a mistake.
"He'd like to be an Eagle Warrior."
"Really?" I showed Sarah what an Eagle Warrior's costume looked like. Now, my wife is very resourceful: for a similar event last year she ran up a toga iraetexta - and if you think of Romans as sporting a sort of white cloak with a bit of purple edging, think again, it's much more complicated than that. But even she balked at trying to fabricate a helmet in the shape of a giant raptor's head. I showed her a picture of a jaguar warrior and she just blanched.
I suggested the two-captive warrior's field dress: a pair of red jim-jams and a conical cap would do for that at a pinch, but it didn't find favour. The best I could offer, it turned out, was the Aztec version of a stab vest, cotton armour with a skirt of feathers around it. (Or possibly strips of leather, according to Dr John Pohl).
"That'll do," my wife said. "I can make the skirt out of strips of card, and he's got an old tunic I can use."
"Er... well, it should be made of quilted cotton, really. Strictly speaking."
I was informed in no uncertain terms that the subject was now closed!