Star Wars: The Clone Wars Season 1, Episode 2, “Rising Malevolence,” showcases this when Jedi Master Plo Koon is stranded in an escape pod with a few surviving clone troopers after being attacked by the Separatist army. The most important function of Phase I armor was that it was pressurized, which meant that a clone trooper could breathe in the vacuum of space. In Phase I, extra features such as macrobinoculars and rangefinders required additional attachments. Notably, their helmets included a life-support system, a tracking device and a commlink. The armor was made out of thick, white plastoid. This was convenient and cost-efficient, because it allowed clone armor to be mass-produced, with each set containing the same basic features.
Since the clones were all based on a single template, they all had the exact same height, weight and build. Because of this, they also used Jango’s Mandalorian armor suit as the basic design for the clones’ armor, which is where the base design of the Clone Trooper Phase I armor comes from. At the request of Darth Tyranus, the Kaminoans used Jango Fett as the template for the Grand Army of the Republic.
