It doesn't have cat armor, just cat clothing, you can make it so it has clothes using the collar texture, but the reason you cant make armor it's because the collar texture changes colors depending on the dye. you cant have iron or gold or diamond on it because it will have a color put on top of it by the game. On wolves you can bypass this having the non colored part of the armor on the wolf texture and the colored part on the collar texture, that's because wolves have a separated texture when tamed, if i did that same thing with cats, every wild cat would have the non colored part of the armor and that would not look good at all