I have been obsessed with Audrey's hair in Breakfast at Tiffany's since I first saw it many, many years ago-although ironically not in any of her more well known outfits.
These pigtails!
http://www.flickr.com/photos/2.....468895316/
It's a little hard to see because it's not one of the better known hairstyles, and I can't seem to find many pictures. But if you could see it from the back, it looks like it is first pulled into a half ponytail with lots of volume at the crown, and then put into pigtails.
My hair is too short right now, and I am skeptical that I could ever, EVER get that much fullness without resorting to a Bumpit...but it doesn't hurt to ask: HOW?