1950s Lanvin Castillo Ball Gown
The cut of the dress reminds me of an eary Victorian style, with a wasp waist, and very slight bustle effect in the back. I adore how they created a slight gather at the small of the back that cascades down into the rich fullness at the bottom.
The gown is in incredible condition, with no flaws at all to mention. If you are tiny enough to wear it (sz 4 or 6), it is a must have.