User blog comment:I Really Like It/Garmadon and the Cursed Realm/@comment-25374175-20150905200115

As Lloyd approached his father inside the Preeminent, Garmadon declares the chains are indestructible. The Green Ninja could have carefully created a step-by-step plan on how to remove the robe, or he could have read the signals on how to take the clothes off with the power of the Sword of Sanctuary.

Plus, I don’t think Garmadon will return of the series would keep dragging on and on, and even if he escaped, you try to explain a reasonable way on how he is still alive after the events of the Cursed Realm’s destruction.

So, for now, let’s presume if he is dead; as we are in the wikia, we will need proof (not hypothesis) and then we establish our edits.