I saw a version of that gown (charles James' "Butterfly Gown", the original of which which he designed for Mrs william randolph hearst) in december at the FIT museum.
I had the same reaction as you--thought about it for weeks, and was inspired to learn more about James. And I blogged about it, too--but my blog has been broken the past couple of weeks, so the post isn't up right now!
It is beyond belief, isn't it?