Okay so select the character model and go to the shaders tab.
Navigate to the "Body" or "Torso" shader on the list.
make sure only that is selected then right click the body shader and select "Copy Selected Surface(s)".
Navigate to the Geografts Shaders.
Select all the shaders in the Geografts list and right click and "Paste to Selected Surface(s)".
Keep in mind your geograft is likely using Uber shaders so if your character has PBR shaders you will need to load the PBR shaders onto the Geograft before you copy and paste the shaders from the base characters body.
Let me know if you have questions.