Multiple unit skin overhauls change the kings' outfits/appearances but when looking inside the pack files they do not have variant mesh definition files under "variantmeshdefinitions." How are they changing their outfits?

I have looked at three mods, and only one has every variant definition from the models.pack listed in the mod's pack file. Yet, all three change every kings' outfit.

The change seems to happen when I use the mods' variant models. I tried changing the helmet of Bardr, of Dyflin. I swapped out the variant definition but kept the variant model files untouched. This result in no change, though this method works for every unit but faction leaders.

Thanks for any help.