You want 5mm minimum. My Pinnacle is a 5/7 I think. 7mm guts and chest, 5mm arms and legs. You lose a lot of heat from your head so a hood is pretty much essential. Moray did some real nice 1 piece suits. You see them occasionally for sale. I like 1 piece but if your diving all year 2 is warmer. Just the bit up your crotch can catch you out in the two piece. The neoprene is the important bit. Yamamoto or similar quality is what you want to look for. It's been a while since I've been suit hunting though. The merino liner in mine is also a very nice thing to have.
How the fuck you dive in 2mm makes me feel cold now. I think I had spring suits thicker than that!
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