period drama       
noun [ C or U ] uk/ˈpɪə.ri.əd ˌdrɑː.mə/ us/ˈpɪr.i.əd ˌdrɑː.mə/ (also costume drama)
 古装正剧; 时代剧; 历史剧
a television or film production set in a period in the past, or productions of this type
  The Crown is a period drama that chronicles Queen Elizabeth II's reign. 《王冠》是一部记录伊丽莎白二世女王统治时期的时代剧。 
 It all amounts to a well-made piece of period drama. 这一切促成了一部制作精良的时代剧。 
 - More examples
 - Now, political period dramas have returned with a vengeance.
 - Fans of period drama will find things to like about The Duchess.
 - From this point forward, period drama mainly went the way of nostalgia.