This is a random thought but I think it might be the case....
I mean, you know how uncorrupted Nephrite is partially bald?
Well, I really think Nephy will have a full head of hair once she's permenently uncorrupted.....
I mean, look at her drawing she drew of her past!
This was before Nephrite got corrupted and she has full head hair here.
So, anyway, I think once White Diamond joins in, Nephrite will have all of her hair and I think it will work similarly of how her tailcoat came....
I mean when Yellow Diamond first joined in, Nephrite just had her vest, then when Blue Diamond joined in, Nephy had a her tailcoat. So, maybe once she's permenently uncorrupted, Nephy will have a full head of hair.
Anyway, I just wanted to share this and it's something to think about. And as I'm thinking about, I can see that it's highly likely that when permenently uncorrupted, Nephy will have a full head of hair. I even posted about it on tumblr! I think it will happen!!!