With the exception of the 'underware' pants and shirt, this mod uses VANILLA Armor.
Vanilla armor though creates HOLES in your figure, that's normal as it is meant to work with non nacked figures, in other words it uses a censoring mask
You can solve this by using the NATURALISTIC SKINS provided by the mod on top of your vanilla armor, in other words by removing the censoring mask

1. Learn the Skin Engrams, these can be found at the same position you find the regular armor engrams and cost no engram points
   
2. Gather 1 FIBER per skin you want to create, two per set - pants and shirt
   
3. Open your Inventory
   
4. Go to CRAFTING
   
5. Open the SKINS Folder
   
6. Open the AU NATUREL Folder
   
7. Select the folder for the armor type skin you want to create, open and create the skins
   
8. Apply the skin to the armor pieces you want to 'patch'
   
9. Use the armor as you please, as long as it uses the skins you will be able to put and remove without getting the anoying holes

The underwear does not need to be patched, it is already Naturalistic compatible
The Skins are only usable on the armor types they are supossed to patch, you can not put a cloth skin in the tek armor or viceversa ... There are other mods that allow you to do that, but they may not work with Naturalistic mods