Found it!

After a great deal of research, undertaken despite the absence of any grants, and fueled only by a Tall -- which is to say, small -- Coffee of the Day, I found the uppermost tippity-top summit of the double extra-greasy slippery slope that led to a new victim class: self inebriating, debauched through absolutely no fault of their own coeds who are apparently smart enough to go to college, but too stupid oppressed to know any better.

We stumbled over the precipice on this day in 1958:

London: "Débutante" became a word with shaken meaning as Buckingham Palace opened its gates to the last series of young women being presented at court. After the curtsies are made this afternoon, the old tradition of presentations will be discarded, in accordance with Queen Elizabeth II's wishes.

Thereafter, according to some prophecies in London's upper social levels, the original definition of "débutante" will have lost its anchor and be free to drift into any sort of new and dangerous interpretation.

The end of the dream world of most ambitious British mothers also is calculated to have a shattering effect in some American homes. This year's trans-Atlantic crop of young women is destined to have no successors bearing the official "court" stamp.

So, there you have it. Ironically, instead of the ugly unshaven head of empty nihilistic libertine atheism, as some would reflexively suspect, it was all the Queen's fault.