You place the items.cfg into the Feral Heart folder, just like you do with the markings.cfg, and then you replace the file when asked. Once you've done that, place all/any .material, .mesh, .jpg or .png file directly into Local Disk (C:) \\ Feral Heart \\ Media \\ Items. Again, relaunch the game and you should be able to see them listed in the character creator, and you should be able to equip them too.