On a more serious note, Ive made wetsuit accessories (booties, hoods) from neoprene that is smoothskin both sides
In terms of gear, I just used a marker to trace out the pattern on the neoprene, cut them out with scissors, then glued them together with standard neoprene glue.
I've known a couple of more ambitious people who made bottoms and even a wetsuit jacket with a zipper down the front. You glue the pieces and they stick together just fine. Takes a bit of practice to get nice seams on the curved pieces, but once you get a bit of practice things go together really quickly.
With the zipper, you glue it onto the inside surface of the neoprene, just to keep it in place when you sew, then glue on a flap of thin neoprene behind that, then you sew through the whole thing with a fairly sturdy needle and 100% polyester thread.
I got the pattern templates from an old, old diving magazine from the late 50s, and it had suggestions on how to modify the pattern pieces too. I wish I had kept it. Now I just design my own pattern pieces, though. It becomes easy with practice.
OTOH, I've never known anyone to make a wetsuit from nylon-covered neoprene that is stitched. That requires a fairly expensive professional machine that does topstitching. The topstitching sews the fabric together to prevent fraying and delaminating, but you don't want the stitches to actually go through the neoprene foam itself. I've been told the reason is that stitches actually reduce the seam strength of neoprene as compared to glue.
. I am also pretty sure someone somewhere did it, I just want to hear their experience, like how did it turn out in terms of quality, fit, cost and such. What tools would one need in order to do it.