I currently use a freediving suit for scuba.
I use a Yazbeck 7mm open cell, attached hood, beavertail, jacket/john, with no zippers.
They are warmer and more comfortable than regular 'scuba' suits generally found on racks at your LDS.
But most or all 'freediving' suits are open cell inside, or spit cell meaning they are raw neoprene and must be lubed up with a mixture of hair conditioner and water kept in a spray bottle to be able to slide in without tearing up or damaging the suit. Without lube open cell neoprene will not slide on skin dry, unlike nylon lined neoprene which does, but the advantage to open cell is that the neoprene is right up against your skin without any layers of nylon to hold water so it is warmer. The other benefit is they dry out quick and never mildew or stink.
I used to think that the neoprene used in freedive suits was very sensitive and would get ruined easily by extended compression times whilst on scuba, but I found that claim to be false.