The law and history are clear.

There are two types of open carrying.

Purposive open carry, predicated on a valid purpose, allowed bankers, sheriffs, coachmen, judicial marshals, hunters, or persons who had been threatened, to carry concealed.

Habitual open carry on the other hand was never legal. It was a sign of a lawless, no good place, and was arrestable as a breach of peace, which it undeniably is.