The nurses in the play must have proper gear. If they don't the audience won't think the play is legit. The nurse must have something covering their mouth and head to look like a real nurse. All nurses will wear these while on stage.
Here is a compilation of 100 of the best YouTube tutorials for nurses that you can use to learn new skills and update your knowledge in the clinical setting: http://www.nursebuff.com/2014/07/best-you-tube-videos-for-nurses/