How to change character appearance in game?

[VeniVidiViciTease]

Is there a mod that lets you change you character appearance once you have started the game, and if there is, can you use it in a world that you created before installing the mod?

[Nieshaw]

you can change it, without using mods. friendship with the witcher Rasmodius unlocked event for change your appearance

[Nakos]

Talk to the Wizard, and become friends with him (I think it's 5 hearts).

[EOEtoast]

At 4 hearts with the wizard, you unlock his basement with the shrine of illusions, which can change your appearance and gender, as well as your name and favorite thing. You can also get new clothes by unlocking tailoring by getting a piece of cloth and going to Emily's house.