Sounds like that part of the mesh needs to be renamed to 'UpperBody' in Nifskope - if that's still how they define which parts should be invisible in first-person.
Sounds like that part of the mesh needs to be renamed to 'UpperBody' in Nifskope - if that's still how they define which parts should be invisible in first-person.
I have no idea what that means, but I hope it's easy to fix.