Was there a rational reason for BK demanding she wear pants? Now in a perfect world free of FDR expansions of the Commerce Clause, a private employer should be able to dictate what their employees wear
for example, if you want to be a playboy bunny you are going to have to meet the standards and wear a silly tail on a leotard three sizes too small for your body. If you want to work at hooters-its tacky orange shorts over nylons. and in a local Pub, the guys wear kilts
but I don't see this much differently than accommodating an Orthodox Jew by allowing him to wear a yarmulke or a Sikh to carry the traditional dagger in his pocket.