It also occurs to me that Garth basically would have had to have been naked and barefoot through the majority of the episode, remember whenever Garth changed his appearance, his clothing and footwear also changed. I figure those were not his clothes, that was Garth's skin. When you saw Garth in his flowing robes, yep that was him adopting baggy skin.
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It might be less problematic to consider that a portion of Garth's abilities were illusionary, along the lines of Talosian telepathic powers (otherwise, why would he still be fully clothed after Spock stuns him?).