Woody2012 said......Only sanctioned under supervision eg. a surf carnival, but if they keep you afloat...........
surfvest.com/ Those things look like an excellent idea. I could see them being very easy to slip on under or oover the wettie.
Shame about the web site. The only information you get is a bunch of videos of mannequins floating face down in the water!!!!

It would be useful to have some detailed descriptions of what you get and how you use it and the benefits etc.
BTW In my experience the water police really, really do not want to book people. If you are behaving responsibly and wearing something that passes for a PFD then they will be happy.