Me in my 1973 Jean Varon/John Bates dress on New Year’s Eve. emmapeelpants has the original advert from Vogue, which is quite exciting to see. This dress has cropped up a few times, I don’t think it’s super-rare. Best thing I own, all the same.
It also came in a different colour, it appears. Here’s one that was displayed at Liverpool Museum. Apparently they retailed for £37.95 which is £360 in today’s money (I picked it up for £45 including P&P!) http://www.liverpoolmuseums.org.uk/walker/exhibitions/feathercuts/printed-evening-dress.aspx