Final answer:
While historical costumes from the studio era were often authentic, hairstyles were usually based on the contemporary styles of the time of production. The role of a Costume Designer includes adapting historical realism to modern perceptions and practical considerations for performance.
Step-by-step explanation:
During the studio era, although a great deal of attention was paid to the authenticity of historical costumes, hairstyles were often based on contemporary styles of the period in which a film was made, rather than being historically accurate. This is in contrast to the late 18th and 19th centuries when an increased interest in historical accuracy in costume design began to emerge. As the role of the modern Costume Designer evolved, designers considered not just historical research but also modern perceptions, aesthetics, and practical concerns such as movement and safety during performances.
Furthermore, when working on Period Plays or productions involving Historic Realism, costume designers must often find a balance between authenticity and practicality. They may reuse existing costumes, adapt them to fit the current production, and ensure actors can safely perform their roles. Therefore, while costume designers strive for historical accuracy in depicting different time periods, hairstyles may occasionally reflect the contemporary tastes to resonate with the modern audience and meet the production's requirements.