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Q: “Why do your Saurons never have armor, etc like he does in the Peter Jackson movies?”
Although he’s rarely described in Tolkien’s work, Sauron’s appearance frequently changes throughout the history of Middle-Earth. One of his defining features in The Silmarillion is that he is a shapeshifter, and often will use this to deceive or overpower his enemies. While I’m certain there were times where Sauron would wear military gear like armor, I think for the most part those types of things wouldn’t be necessary, given his abilities.
Sauron is very much hands-off unless cornered into a fight, so a general depiction of him, in my view, shouldn’t be one of a heavily-armored “black knight,” which is an image more appropriate for, say, the Witch-King. That said, it seems likely that during his battle of the Last Alliance with Elendil and Gil-Galad, Sauron would certainly be wearing armor. With this in mind, Peter Jackson is completely justified in portraying him as such, and given the need to simplify for the film, is also justified in keeping him in that armor for all of his on-screen depictions.
For me, however, I’m more of a fan of portraying him as a sorcerer who’s into fancier dress, or, with The Necromancer, almost a dark version of a wizard like Saruman or Gandalf.