Exposure Protection

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Wetsuits work better the less wet you get, thus, semi dry and the very good Italian free dive suits. Keeping water warm is a waste, it's mass and you waste heat keeping it (mass) warm. So neoprene works by keeping heat in, not warm water. The myth is based on the idea that the water next to you is warm but as all heat energy comes from you, it's still a waste. If it was true, dry suits wouldn't work or we'd have wetbag suit. 

Have something warm to drink right before the dive. Heat inside the body is the best. Decaf lemon tea is my favorite for winter camping.

Duct tape the boot/leg and glove/arm transition to prevent water transport. My neck in back pumps water as I breath and that's a huge waste but I rarely dive it anymore so I have not worked out a solution.

A polartec (fleece) also helps fill in the spaces and reduces water (mass) but the hood is the best value.