1950's Jaques Fath
Oh. My. Goodness. If you are a fan of vintage clothing (and you should be!), check out shrimptoncouture.com. Here you will find gorgeous, museum quality pieces ranging from the late 1800's all the the way to the 1990's.
I've fallen in love with several of the dresses already and loved just browsing through the pages. Check it out if you have a spare hour!