I have seen artwork about the secret Alice dresses. But I don't know how to unlock them. Are they in Alice Madness Returns or are they in the original, if in the Madness returns one, how do I unlock them all?
They say it's downloadable content but that must be true for the consoles only. As far as I am aware, it is only accessible by doing this. The explanation's a bit technical but here it is. (It's mostly copy/paste from where I found it.)
Go to My Documents\My Games\Alice Madness Returns\AliceGame\Config\
Open AliceEngine.ini (it's a text document so notepad should do it)
At bottom under [AliceGame.AliceGameEngine], change GIsSpecialPCEdition=FALSE to TRUE will unlock all DLC dresses and weapons.