Thank you, Zeeskeit! It is not just a father’s role to “give tochacha”; it is to be mechaneich and that relationship starts when the children are infants.
It is very true that if the only communication a father has with a daughter is one of giving tochacha, it won’t help very much to start in on tznius issues. While certain topics are less comfortable than others for fathers to address, there are many ways for fathers to express their opinions as well as to be the backbone for halacha for the entire family.