I've seen a ton of people doing this bug lately and it's been causing a lot of general confusion. People are able to reskin their character to look exactly like another character. I don't know exactly the process,
but I believe they edit save files corresponding to characters outfits (for example giving wendy a wolfgang preset), then in game they go to the wardrobe and they select the preset they edited to reskin their character to look like another character. What is done is you type GetPlayer().prefab = "character" into the console, then you use wardrobe. They can even change their ghost skin to look like another character's ghost skin.
wilson skinned as willow -
I haven't done it myself, but I think you edit your files and then use the wardrobe.
Type GetPlayer().prefab = "character" into the console, and use wardrobe.