Accordingto the Attorney General of NC, if a firearm that is being carried on the person is not easily recognizable as a firearm to a reasonable person, then it is concealed.
So the above pictured carry modes would classify as "concealed" under NC standards and practices.
Those tiny NAA revolvers that mount in a belt buckle--even when in "plain view", fall under the NC AG's interpretation (in fact, the interpretation specifically articulates such belt-buckle guns), because they can easily be mistaken as an ornamental buckle...
However, in NC, a 1911 in an IWB holster, with the majority of the grip visible would NOT classify as concealed, because it is "easily recognizable as a firearm".
Of course, the standard for what denotes "concealed" varies WILDLY from state to state, and in some places, even from officer to officer. In matters of "non-conventional" carry modes and whether or not a given instance is or is not "concealed, it is often left to the courts to decide. If a LEO says it's "concealed", you are NOT going to argue your way out of it standing on the street. But it CAN (and usually IS) very easy to argue out of such a charge when you are finally standing before the bench...
NC Judge: Officer Smith, what is the charge?
Smith: Carrying concealed without a permit.
Plaintiff: And how, Officer Smith did you know I was carrying a firearm?
Smith: Because I could clearly see there was a handgun sticking out of your waistband.
Plaintiff: How did you know it wasn't a cell phone, or some sort of tool, or a walkman?
Smith: because anyone could plainly see it was a gun.
NC Judge: Case Dismissed...
Of course, in any other state, YMMV.
The bottom line is , if you are OCing, and you get charges with Carrying a concealed weapon without a permit, the FIRST thing you should do is STFU.
And the second thing you should do is LAWYER UP...