What Vatican II Actually Says About Changing Nuns Habits
This is what the Council said and did not say. You decide.
"Since they are signs of a consecrated life, religious habits should be simple and modest, at once poor and becoming. They should meet the requirements of health and be suited to the circumstances of time and place as well as to the services required by those who wear them. Habits of men and women which do not correspond to those norms are to be changed."
-Vatican II, Decree on the Appropriate Renewal of the Religious Life (Perfectae Caritatis), 17.