Per Sylvain Fauvel:
I would go for a Bottom or 1 piece with socks Attached. Cold feet is a
common problem, even with a dry-suit.

What concerns me about my one-piece bag suit with integral
GoreTex socks is the prospect of shipping water, but not having a
place (ankle gaskets) for it to drain. It would just pool in the
legs. At some point, the weight of same could impede re-entry
into the boat.

Comfort/convenience-wise, it's the cat's meow, but I wouldn't
call it bulletproof.
--
PeteCresswell