I have no idea what kind of bug is this but lately i'm seeing more and more Cantabilian 20-30 PvP'ers without helmet, including me.
We have helmet equiped but can't visualy see it on our character (triple checked that i have it turned on under options, re-equiped it and reloged and still doesn't work).
I got the same problem, the reason why i'm posting this bug here.
I really hope GM's can fix this because it's really frustrating to play like this, i'm not used to look at my hair while pvping.
Thank you for your time and understanding.