This is the problem that causes the pigtail glitch. It doesn’t work correctly, though, as sims would also age up in their ‘naked’ hairstyle. For example, if your sim is wearing the base game beanie they would shower in a different hair. You might have noticed some EA hairstyles have a different naked hair set to them. Well, I have good news, after some investigations I finally figured out what actually causes the pigtail glitch and how to fix it. You might have seen my default replacement that battles this problem, but of course it doesn’t actually fix the problem - it’s just symptom relief.
