I did some more research and found out that China apparently had something called You Xia, who were considered lower class and also referred to as "wandering vigilante" (ronin) and upon further investigation guns had already been introduced to China at that point, so this costume makes total sense if it is Chinese! By the way if you can contact me on Skype (live:dj02262002), Discord (FeztacularGames#3893), or just use my email ([email protected]).