A large proportion of English speakers hear frock and a girl's dress comes to mind. Another large proportion of English speakers hear frock and a male monk's attire comes to mind.

Frocks may be worn by some monks inside or even outside monasteries, while some nuns may wear frocks even when outside the convent.

Some have X -- not F or M -- as a sex designator on some passports.

Now who wants to see whom defrocked?