Throughout the work on Tzniut entitled Oz VeHadar Levusha, by R. Pesach Falk, he refers to a separate book of his entitled "Mekorot" which includes a more complete list of the sources he bases his ~700-page encyclopedia upon.
However, I have been unable to find any mention of this book online. Does anyone know where this book can be viewed or purchased? Or perhaps, it has still yet to be published?