Please keep in mind that IANAJ so my understanding is limited. Also I don’t know if this would be considered theater/movie related or General Questions, so mods please do as you need.
I understand that Orthodox Jews are required to keep their heads covered with a yarmulke. I also believe that some of Kabbalists wear a hat in addition to the yarmulke. I am wondering, though, about whether or not an actor can put something over the yarmulke to cover it up so it will not be visible as he portrays his part. Can he wear a wig or baseball cap and not be going against his faith?