Is it illigal to wear a bullet proof(kevlar) vest in public not concealed?

In the United States, it is pretty much illegal to carry an unconcealed firearm in public places, unless you are law enforcement. But you are allowed to have a concealed firearm for self protection.

My question is if that rule pertains to kevlar/ bullet proof armor in public as well? Do you have to conceal it under your clothing if you want to wear it?

I hunt occasionally with my father. I have kevlar armor just in case some accident happens and i get shot. Also, it gets kind of scary walking the streets of LA. I don't feel safe without my vest and firearm.

ps. i don't anticipate being shot at very often. Just precautionary actions.