Custom Skins are editable textures of Yandere-chan's face and skin, barring uniform textures.
Custom Face Edit
Custom Face affects the texture of Yandere-chan's face and eyes. These can be edited to alter the player character's facial appearance.
Custom Nude Edit
Custom Nude changes the texture of Yandere-chan's naked body. Any changes will only apply to this texture, even if the uniformed textures have skin as well. Most of the skin will be covered by white steam clouds in-game.