Why is the selection of "Sitting in the Palace" in the Beijing Opera "Shiro Visiting Mother" originally set in Dasong, but the princess of Liao country has to wear Manchu women in Qing Dynasty in Beij

Why is the selection of "Sitting in the Palace" in the Beijing Opera "Shiro Visiting Mother" originally set in Dasong, but the princess of Liao country has to wear Manchu women in Qing Dynasty in Beijing Opera? Avoidance of reality in costumes has won a broader stage performance space for traditional Chinese opera art, and also reduced the performance cost economically. It can be said that every traditional Peking Opera drama is a successful stage commercial operation, and its economic benefits are already thousands of times the cost of creation! Peking Opera is an imaginary and freehand art, and its advantages and characteristics that distinguish it from other arts are also here. If you like to see which dynasty's costumes wear art, please watch movies and TV series. They are realistic. Freehand brushwork and virtual Beijing opera is my favorite. Up and down for five thousand years, there was a theater box, which did not belong to any dynasty!