So I can access the zombie den but I can't access the alchove. Do I have to 'put' the skin on in the wardrobe or something? When I go to my wardrobe and click skin or any other tabs, nothing happens :S. I haven't changed my avatar in like 2 years or more.

You just have to select skin > pick a zombie skin that you have and wait for the cache to update.

Everyone now has access to the zombie den now btw, not just zombies any more :)

So your problem is that the tabs in the wardrobe don't work? What sort of device / browser are you using? (And yes, the alchove still requires that you have a zombie skin on to access it, although no other zombie areas do.)

my wardrobe finally loaded after retrying for the 3rd time

I know, answered that part and I was acknowledging the fact that the zombie den was changed to no longer be zombie only like it used to be