The job requirements are probably in their contracts and include looking good. Of course that is no excuse for sexual harassment, but would mean that there is a lot of frank talks about appearance and positioning on set. And the management probably does ask them to model their appearance.
I wouldn’t consider that harassment. They are in the entertainment industry.
I read the complaint. It states a facially valid claim for sexual harassment but, loaded with provocative details that threaten embarrassment for Fox News in discovery and at trial, seems aimed most of all at a settlement — which is how most such cases are resolved.