As of today, the Hair Layer is missing in the Beta Wardrobe. This is making it so that the hair preview function in the Hair Salon does not work; it also is not working in the regular hair salon either. Putting on hair is a blind thing right now. I tried clearing my cache/browsing data in Chrome (which is up to date) to see if that did anything, and it did not help.

Now, changes made do save, as once I exited, it showed in my avatar picture, however it just doesn't show in the Beta Wardrobe line up, or in the Hair Salons. Just leaving a note here so that you guys were aware.

Edit: Apparently even though it shows in the avatar image on the Wardrobe page, it does not show anywhere else in the site, as my avatar on the forums and sidebar has just proved to me. Eep. Mega eep.

Edit 2: Hrm. I was able to get it back by changing the hair layer's position in the old wardrobe, then clicking wear outfit. It's still kind of a bug to have it disappear in the beta wardrobe though - if the old wardrobe wasn't around, I'd have been without hair! Maybe having a default reset sort of button in the beta wardrobe would be a good idea?

I have the same problem! And then I used your edit 2 to figure out how to at least get my hair back, so thanks for that! Good thing that the old wardrobe is still there right c:

This happened to me a while back and I got it back the same way you did, I'm pretty sure that's not supposed to happen though and I really hope Keith can fix and prevent it.