A recent case where a female casino employee was fired for refusing to wear make-up on the job is part of the newest test to see how far companies can go in mandating employee appearances. The employee claimed that being forced to wear mascara, lipstick, blush and face powder on the job was humiliating, and also a case of gender discrimination. In court, however, employers usually have the right to hold their employees up to standards held by societal norms, which is especially true for cases in the entertainment industry.
See "Fashion checklist: No blush, no lipstick… no job", Rhina Guidos, The Christian Science Monitor, July 17, 2001