It'd be a simple mod, sort of like the wolf armor and storage mod. I think it'd be cool to have armored cats.
What would the benefits of a cat wearing armour be? If you just want it to be visual, you could proably find a texture pack.
Do not call me "TabbyExplosive" it drives me insane.
GENERATION 38: The first time you see this, copy it into your signature on any forum and add 1 to the generation. This is a Social experiment.
They'd have more defense from the armor (if someone hits them less damage is done)
Why not ask "wolf armor and storage" mod develper about it?