The powerful hierarchy of the faith stipulates what kind of dress men and woman should wear at the halls and every where else
as everyone knows, pants suits in their eyes is just too casual of an attire for appearance's sake.
Remember there is an in-obvious initiative to make gods organization look as good as possible to the rest of the world,
so the personal grooming and appearance by the members has been constructed around that.
Another thing too woman appearing masculine and not womanly is encroaching too closely to this very male dominated
religion, whether people like it or not woman play as second class citizens/servants to the dominant males.
This is an old boys club with old morals and standards and it appears they very much like it that way.