With record breaking heat lately out here in southern California, wearing a Boba or Jango costume may become unbearable. So I searched around the web and found this as a solution to provide relief in the hot climates. They sell for $150 each. I'm thinking maybe the coolant canister and the mechanism can be hidden in the suit pouch (if it fits) or inside the jet pack. Here is a description straight from the site itself.
The Port-a-Cool System is developed specifically for those applications that cannot accommodate a cooling unit, Port-a-Cool is an easy, affordable way to get quick, instantaneous relief from the heat. A CFC-Free, non-flammable Freezing Agent is supplied on demand to the COOL SHIRT making this system a favorite among kart drivers, motorcyclists, drag racers, etc.
The system comes standard with a heavy duty 100% cotton HANS-Friendly COOL SHIRT with over 50 feet of medical grade capillary tubing securely stitched to the front and back of the garment.
One 12 oz. Can of Port-a-Cool CFC-Free, non-flammable Freezing Agent
Sturdy Can Holder that can be mounted or hung from the drivers belt
100% Cotton HANS-Friendly COOL SHIRT with connectors (select size)