V.B.
I have a wig that I wear because I am going through chemotherapy right now for breast cancer. I had to try it on a couple of times before I shaved my hair off and they gave me a little stocking cap to wear over my hair that helped keep it on my head, but I will say that it DEFINITELY fits better now that I don't have any hair. Even with the cap, it would still slip around a little bit. It sticks pretty good to my bald head though! Not sure how this helps you since I'm assuming you want to keep your real hair. I guess I would try the stocking cap. Any wig store should have them or be able to tell you how/where to get them. Hope you find something that works for you!