I accidentally clicked the wrong button in my wardrobe and accidentally removed the checked items from my HA instead of the other way around and...my zombie self isn't showing. It shows that I've cured and I've not done anything of the sort! What's going on? :( Have I been automatically cured for some reason? I want my zombie self back! :(

The wardrobe rarely shows my Zombie or Zapper skins. Check The Healer and she can confirm if you still have a virus.
It should look like this if you are a zombie (the bottom refers to the deer skin)

AFAIK, there is no option in the wardrobe that would alter the base of your HA.
It's shown me as a skeleton since I became a skeleton. I was in total shock when I saw human skin. Thanks for the reassurance. It's just going to be brutal trying to match something to a skeleton when you can't see the skeleton :/

It might be a passing bug though, I've had my deer skin since before the new wardrobe, so I couldn't tell if it's displaying the zombie inside or not :(
You could probably add it to one of the Wardrobe Problem and Bugs thread, cause it would kind of be a big deal if you one could see their skintone.