Yeah...I mean, of course they didn't use an actual diaper for it, and calling it a "diaper" in the movie would have just come across as silly.
But...it does LOOK like a diaper. And as others have said, I would imagine that it would have served the same purpose in that situation...not just be used as clothing.
So I don't think anyone thinking "diaper" when they first saw it is someone who goes around looking for and getting excited about diapers everywhere they see them.
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