At the time that was written, men wore robes that are basically dresses

I remember going to Dragon Con the year after this movie and there were SO many dudes dressed up as Nurse Joker, and I have to assume a fair number of them were just holding out for the opportunity and excuse to dress up as the nurse they had always wanted to.

Men should wear whatever they wish.

I pray for more men rocking kilts, skirts and dresses! (╯˘ -˘ )╯