Glasses: unisix light armor helmet, assigned to knee body part in CS. Nif appears to be knee-specific.
Robe: male and female versions of clothing, assigned to chest body part in CS. Can't really tell which bodypart(s) are involved in the nif.
The trouble is, if an NPC or the PC is wearing the robe, the glasses do not show up. This leads me to believe there is some specific body part assignment within the robe nif that hides the knee, but I can't make heads or tails of it. Incidentally, when wearing the glasses without the robe, greaves disappear, but are still equipped and included in the armor rating (as expected).
Rather than change anything in the CS, where things seem to be working, is there something I should be looking for in the robe nif itself? I've noticed the glasses don't disappear when wearing one of Korana's floor length dresses and they are designed for the ankle.
I only ever check out nifs in Nifskope and I don't really understand how they work (obviously). If the solution isn't simple, I probably won't be able to wrap my head around it.
BTW, I am not claiming anything is wrong with either Cali's glasses or Danae's robe. They are simply not playing nicely together for me. I've talked to Danae about it and she can't replicate my issue with her version of the files. She's a bit busy now and won't be able to get back with me for a little while. In any case, I'd like to understand the issue rather than just replace the nifs when she gets back. Anyone have any ideas?