how would it be nude if the mod is removed? the mod is what makes the character nude xD
The swapping is done with edits to the multiplemodeldesc.xml file.
This does not edit textures in any way, it just makes the game pick another model (swap).
How to get nude, there are 2 ways, one way is a model swap from any armor to the nude model..
Another way is to wear kibelius costume and edit the textures to hide the kibelius armor, with resorep.
Edit : you ofc need resorep with both methods to have a good body texture, but i mean if you want to appear nude wearing armor, you need to either use an armor swap or edit textures of the armor you are wearing.
Which method are you using?
Edit 2 after reading your edit : from what i understand then is that your character will only be nude if she wears the kibelius armor? that is being swapped from kibelius to nude?