To make the admin armor show up in the inventoryHud for only the superadmin, first in inventoryHud.cs, in function InventoryScreen::updateHud, after these lines: 


//Create - ARMOR - List
   %armorList = %client.favorites[0];
   for ( %y = 0; $InvArmor[%y] !$= ""; %y++ )
      if ( $InvArmor[%y] !$= %client.favorites[0] )  
         %armorList = %armorList TAB $InvArmor[%y];

add this:

   if ( %client.favorites[0] !$= "Admin Armor")  
      if (%client.isSuperAdmin)
         %armorList = %armorList TAB "Admin Armor";


Now an extra check to make sure noone else can hack thier way into getting the armor.
In player.cs, add this to the top of function Player::setArmor:

if ((%size $= "NameOfAdminArmor") && (!%client.isSuperAdmin))
   %size = "Light";




The rest is the same for adding normal armors. 

-edit 
Make sure you add that last part after %client = %this.client; in Player::setArmor.