Alright, so I submitted a ticket about this and was redirected here, so here goes. I'll copy most of it to this thread:
I recently purchased the Mage Knight Outfit with some of the gems from pre-ordering the expansion, very excited that it was finally back in the store one of the times I actually had gems to spend. I put it on my female norn, hid the headpiece, and then instantly noticed a massive issue. She has no neck. Just a blank hole where her neck should be.
Due to her using one of the recently introduced faces, I thought it could initially be just an issue with that and so switched to my female norn ranger who has existed since 2013 and has one of the original faces.
And nope! She also has no neck!
At this point, I began to check my other characters, finding that that female sylvari, female human, and male human with the headgear hidden on this outfit do in fact have their necks, which I am assuming is the actual intent. After them, I went to my male norn to check the outfit on him. While it was significantly less noticeable, I discovered curiously that he, too, is lacking a neck when the headgear is hidden on this outfit.
If at any point whoever would be the ones to work on these kinds of things can be shown this, please fix this. Norn deserve necks too.
Additionally, as a very minor aside but related issue to armor modeling with norn which isn't a big deal but I also just feel like should be known is an issue and has been for a while: the medium Whispers boots (Whisper's Secret Boots) on male norn have little holes in the model that you can see the foot through on both boots. This isn't an issue on female norn, just male norn. I imagine their toes are getting rather cold like that.