Well, I've been riding for 5 or 6 years now, and I've noticed that some of the hairstyles I used to favour have fallen by the wayside.
My hair's dead straight and about waist-length. It lies nice and flat for a helmet, but only when I wear it in a braid. A ponytail, if it's low enough to fit the helmet over, just turns my hair into a shoulder-check obscuring black cloud that I've got to comb out later.
How has your riding lifestyle affected your riding hairstyle? Do you go to a stylist? What do you do about it when you're wearing a style you can't mash a lid onto?