I recall watching a lecture on Youtube where the lecturer pulled up a picture of the same armor as an example of archaeologists misinterpreting the purpose of w

I recall watching a lecture on Youtube where the lecturer pulled up a picture of the same armor as an example of archaeologists misinterpreting the purpose of what they find. The lecture hall, filled with professionals, started laughing as if it were some obvious well-known mistake of the archaeologist misidentifying it as armor. Still not sure what they all thought it was.