First, with notepad++ clean the lods for the player
as showed hereRepeat the process for the headband too.
Then in in blender (i use 2.79)Load the player highest lod
On the top right, rename
hihead to whatever you want
Then load the headband highest lod
At this step you have to see the player, and the headband.
Still on the top right, be sure to Select the headband scene ... called hihead (now, you understand why we renamed it in the first place)
Then, switch to EDIT MOD (press E)
Select All (press A)
Then Scale : press S, then X to scale X axis.
Repeat For Y and Z axis if necessary
You can move the headband by grabbing it (G key in Edit mode) if necessary.
You can also make a rotation (R Key, and select the axis too).
When edit is done, switch to Object mode, press A to select all, then export the headband 3D model.
Open pngXXXX_headband.iff with 7-zip (or whatever tool use use to manage compressed files)
drop the new .model file
its done