This one is not USCG approved, but most of the regattas around here that I compete in don't require us to have one. The main benefit of having one is that they are much less bulky, and ride lower on your backs.
Musto sell one that might do what you want. it is a buoyancy aid, It is good on light winds when there is less chance for you capsize or be hit by the boom. On heavy wind, it is better to use a regular life jacket.