This guy was at the Art Car Ball too. On the back of his space suit is an air tank with plants inside. Also, I didn't notice it at the time but he appears to be in bare feet. I don't know if that's part of the costume or an attempt to cool off.

EarthMan is a self-contained, self-sustaining bio-environment survival suit featuring the Air Terrarium BackPack Oxygen/Air Survival System®. Theoretically, it can maintain a human in oxygen free, contaminated or otherwise extreme environments, in outer space, and even in the most polluted and unlivable environments on Earth.