Shall not be infringed. Shall NOT be infirnged. Shall NOT BE infringed. Shall NOT BE INFRINGED. SHALL NOT BE INFRINGED. Any questions?
I don't know that concealed carry was viewed in 1787 the way it is viewed in civilized parts of the U.S. today. I think at least the Founders might have thought there should be no need for an honest gentleman to conceal his armament.
That having been said, if a state or municipality regard the open wearing of armament as a breach of the peace, I would say that they must of necessity then allow people to carry discretely. I suspect given a choice, many municipalities would actually prefer the latter.