Has anyone ever heard of a wetsuit that has attached gloves and booties?
I think at some point we've all been sitting in cold water (some colder than others) and thought wouldn't it be nice to be a little warmer? So I see where your coming from with this. The biggest problem with this is, when water gets into your wetsuit, it has to get out. I don't buy back zips anymore. I've had the zippers fail on me in solid surf while duck diving, several times over the years. When your suit suddenly fills up with a couple of gallons of cold water, it's no fun and potentially very dangerous. An extra 3 gallons of water is, what 7# a gallon if I recall, so 20 pounds? That's no joke, it starts dragging you down quick. At that point, you just want it to flush. If your suit is a closed system, with no way for the water to exit, you're going to have a problem. Overcome that major design barrier and I bet you could get this to work. Luckily I will never need one, but I'm not your potential market. Good luck. Time to go surf.