You will find these robes throughout your game. You do not have to cheat for them, unless you want to, of course.
Killing the Tukata Queen, killing the Sith Rebels in the Korriban Caves, killing Juhani on Dantooine, and killing the Mandalorian Commander on Kashyyyk. Full disclosure on how and where to collect robes are listed in the Readme! Yes, as you can see. I'm all about killing fools xD DARKSIDE FTW