I posted a while back about how Tarlov seemed to be doing less damage on crits and he is now wearing a monk outfit instead of his red dragon scale armor. A dev replied in that thread and said that the hireling changes are only cosmetic.
I'm now wondering why I can cast Fire Resist on Tarlov. Before It would not take because of his red dragon scale armor. I can cast Acid Resist on the 24 FvS hire too (before update it would not take because of his green scale armor).
I don't know if this is how "Cosmetic" armor upgrades work. Anyone else know?