We've all heard lay people ask a thousand times: "Why did the nuns stop wearing their habits?"
Then there's always somebody in the group who answers: "It was Vatican II." But the truth is it was actually a "stretching" of Vatican II.
Be informed - this is the line the orders used to dump their religious garb:
"17. 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 Council II, Decree on the Appropriate Renewal of the Religious Life (Perfectae Caritatis), 1965.
Insane, right? It was the sixties and they "stretched" this into meaning no habit or not much of one.