I got a reasonable stash of dresss and I found this Butterfly by Matthew Williamson 1920s-inspired dress while rummaging in some boxes.
(I think I bought this one in 2007)
I don't reach often for a LBD but the amount of sparkles and crêpe texture makes it reminiscent of the Flapper era, therefore a cute little number for warm summer nights.
It's the type of dress they might wear in The Great Gatsby. I loved that book so much so I am really looking forward if the film will have a similar aura. I like the pick of actors, though.