Here is a great article & video from Queens of Vintage on how to do hair like Brigitte Bardot. She uses a "bump-it' in the video but I prefer to just backcomb and hairspray. I have not tried the bump-it but I imagine it would show in my hair since I have very fine hair. Sometimes I can even get the same volume with hairspray alone.
And the essential is the perfect black headband or scarf. Here is one by etsy seller mixbaby.