Sally Jupiter Costume (Silk Spectre I) from Watchmen

Step 17 Hair and other requirements

You now have the finished dress, glove, wristlet, garter panties/suspender briefs, and the earrings.

The rest of the costume you will need: knee-high black laced boots, fishnet thigh-high hosiery, and a metric ton of bobby pins for your hair (or a wig.)

For the hair, the easiest way to get her hairstyle is to do "Victory Rolls".  The sides roll up and over, the back is up to you, and the front needs to roll under to give the look of bangs.

Some people do victory rolls simply with their hands, but most people need an aid, something to wrap their hair around and remove before pinning.  You can find aids in the form of a "foam foundation" or those long flexible hair curlers that are completely smooth.  In my experience, the foam foundation is easier to work with for victory rolls, even if your hair is very long (mine is past my bum, and everyone was amazed I could get it into this hairstyle).