The drama is set in the fictional empire of "great Jin/Chin", so I guess I was correct about the Qing-ish dynasty. But those extremely long pointy "back flaps" are a real historical detail. They were part of the mandated uniform of officials for a while, as a measure to keep people from Doing Intrigues. Ie; if you try to whisper to your neighbour in court you get his back flap in your eye. Probably a Ming dynasty thing, but don't quote me on that.











