You can go as a 50s starlet, just take a look at Anita Ekburg or Diana Dors, or Barbara Lang, or Bevery Michaels
You could also add a pair of wings and go as a fairy
add a pointed hat and be a sexy witch
add a pair of vampire teeth and some ghastly makeup and be a vampire (the vamp bolero = perfect for pairing with it in this case)
Get a jacket and carry a tray around with cigarettes (50s cigarette girl)
Just add a black mask and opera gloves to be sexy-sultry with a costume
add ears and a tail - Playboy bunny
zombie makeup would look cool with a sexy dress as well :)
I totally agree with those ideas Shy Anne! Especially the cigarette girl idea and the zombie makeup idea :)
Zombie makeup makes every costume cooler ;)
Get a veil or hat with veil and be a merry widow. :)
Holly Golightly maybe?
It would be difficult to suggest you without looking dress but, still I am uploading some pics that might help you to convert your dress into a Halloween one..Have a peek here ..
Oooooh all three are awesome but if you could make a pinup version of Darth Vader or Black Widow that would be AMAZING!!! :)