Clone armor

Clone armor was the magical plastoid armor worn by clone troopers in one of the many parallel universes that existed beside. What made it special was that the clones had a strong spiritual connection with their armor, much like a normal person did with their daemon. Because of their artificial upbringing, clones didn't have daemons for souls. After their training on Kamino was complete, the Kaminoans played a ritual in which the clones were blessed with the armor that would make them able to go to war. As a daemon was someone else's soul, a clone's armor was his soul.

Phase I white
At the start of the Clone Wars, the clones wore identical stark white armor, which signified that their individuality was still in its infancy, and their souls were still developing.

Phase I colored/customized
Later in the war, clones were encouraged to customize their armor and personalize it, and in doing so, their armored souls became more distinct, and they became more like individuals. Some clones who did this included the ARC troopers, Captain Rex, Commanders Cody, Gree, and Bly, and common troopers like Waxer and Boil.

Phase II colored/customized
The approximate year and a half the clones wore Phase II armor was the Golden Age for their souls. Customizations became even more personalized, and troopers wore it with pride and dignity. Commanders Cody, Gree, Bacara, Bly, and Neyo had perhaps some of the most distinct armored souls of all, ordinary troops became distinct, like Fives, Echo, Jesse, Hardcase, Kix, Tup, and Dogma of the 501st, and Rex had the best of both phases with Phase I/II hybrid helmet.

Stormtrooper armor
Shortly after the clone troopers became stormtroopers, almost all armor was returned to a blank white, and the customizations were removed, too, because of the new Imperial protocol of uniformity. Within several months, most of the clones rapidly lost all their individuality, because stormtrooper armor was a new kind of soul, a sort of zombie soul that enslaved their wills to the Emperor and destroyed their minds, making them think of how they could fanatically and violently serve the Empire. Later, when the Empire started recruiting stormtroopers, the cadets were cut off from their daemons, and the new armor turned them into the same enslaved souls their clone counterparts were. One might almost have said that the troopers who died during the Clone Wars, despite their early deaths, lived a more fulfilling life than those who survived to be the slaves of lifeless souls.

Behind the scenes
The idea of clone troopers having a spiritual connection with their armor was inspired by the Panserbjorne, or armored bears, from Philip Pullman's trilogy His Dark Materials and the movie The Golden Compass, who also considered their sky-iron armor to be their souls.