What the devil is a hair rat, I hear you ladies ask. WELL a hair rat is a form of padding made out of your own hair. Collected from hair brushes and combs, and then stored in a zip lock bag until you have enough required. Your locks can then be transferred to a hairnet (preferbaly the same colour as your hair) and then be rolled, squeezed and tweaked into shape and then sewn to secure it. For 40's faux bangs, a sausage shape is required. For 60's beehives, a flatter more 'puffy' shape is required. Tailor it to your hairstyle!!
Yes, you can buy hair rats made from foam, but these tend to give a finish which is too rigid, and not authentic.
Hair rats do not need to be washed that ofen, but if they do become a little greasy, soak them gently in warm water and shampoo and leave to dry throughly before storing.