I don't know if precedent has been set, yet. I'd be very interested on finding out because, at this point, different LEO's have differing opinions on what constitutes concealed. The statutory definition reads something to the effect of - concealed from the ORDINARY sight of another person. the statute does not capitalize "ordinary", I do because I believe that will be a very important word if/when someone argues against a concealed weapons vioaltion in court. Truth is - our statute really provides the on scene LEO with a large amount of discretion and, until precedent (case law) is established, it will be up to his/her discretion whether or not a knife is "concelaed". Personally, I consider a folder concealed when the only portion visible is the clip. I also consider a fixed blade concealed, if a person's shirt is covering the entire handle and only the bottom portion of the sheath is visible.
It gets a little worse. AFAIK FL does not have any state protection, of knife bearers, from city/county ordinances and I have read some VERY FRIGHTENING ordinances. They seemed to be around the beach cities in Pinnellis county - Madira beach, Bel Air beach, etc. Some of them had wording with references to blade lengths, one actually said "no knives". So, there are cities in FL (Orlando is not one of them) that have more restrictive knife laws than the state does.
The good part about the LEO having a large amount of discretion is, if you are not otherwise 'asking' to be arrested, chances are that discretion will lean towards your favor.
A lot of LEO's will take into consideration whether or not you were attempting to comply, with the laws, and perhaps are just a little unclear on them. For example, I have only arrested ONE person for carrying a concealed weapon, ever. The others, I encountered, I simply explained how they could adjust their carry methods to avoid any problems