OK, How about Dry Suits?

[Dewit2it]

The last I saw of the Harvey's Aqua Capsule 1/4" neoprene was $990.

Just make sure you have quit growing before you buy it.  I got my first one too young and grew out of it.  And that was expensive at $550 in 87.  I normally wear just running tights and a t-shirt under it.  The thermocline will still be a shock on decent, but once you start swimming around, you will get hot quick.