Possible Clues:

• Make-up
• Feature film put on before the big fight
• *2017 Broadway musical based on the rivalry between Elizabeth Arden and Helena Rubinstein
• Displaced pair in need of facial adornment
• Make-up used before battle
• Bias isn't commonly seen in cosmetic treatment
• It may be used to put on a brave face
• Battle decoration
• Facial decoration showing hostile intent
• Cosmetics, slangily