What is name of a Notre Dame sister's head covering?

as this is a French Order, lit Our lady (st.Mary) They would use French nomenclature. Probbaly the term Serre-tete for the overall headgear. as this is a French Order, lit Our lady (st.Mary) They would use French nomenclature. Probbaly the term Serre-tete for the overall headgear. as this is a French Order, lit Our lady (st.Mary) They would use French nomenclature. Probbaly the term Serre-tete for the overall headgear.