For the remains, a Cylinder Map will do nicely.

Make the appropriate adjustments to all the faces.


In the UV Editor, Use Face Select mode and show ID 2 only then apply a UVW Unwrap.


Select the faces of the dimensions shown above and apply a Planar Map.


In the UV Editor move and adjust the new UV sets.


Here we see the UVs adjusted for ID 2.

And now ID 3.


Move and adjust as before.


The Bust Armor smoothed with the finished UVs .



For the Shoulder Armor, We use a Spherical Mapping as it suits this part better than Cylindrical.

UVs before adjustments and after the final improvements.

The piece smoothed and with the adjusted mapping.