Yes. Search this forum. After senate republicans killed OC last year, this topic was discussed. A bulge that an officer suspects may be a gun=concealed. If the outline of a gun is clearly visible=not concealed. My comments on the holster are extrapolations.
Incorrect. Just because an officer sees the outline of a firearm under a shirt does not mean it is not concealed per statute. In fact, there is currently a circuit split between the 3rd and 4th DCAs in Florida as to whether or not a "bulge" recognizable as a firearm constitutes probable cause for a search. It is as yet unresolved, nonetheless a bulge or outline does not make a firearm unconcealed.