Per Micheal Artindale:

Am I right that I have to peal off all the layers to do what is nessisary?
Any other options besides dehydration?

Some dry suit makers offer what they euphemistically call a
"convenience zipper".

Basically a fly - but done horizontally with a dry suit zipper.

I got one on my Kokatat because people who knew said it was a
"must have".

Personally, I wish I'd saved the money:
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- One more potential point of failure

- Another zipper that one can forge to zip
or not zip completely enough.

- Using it on the water? *Bad* idea IMHO...
so we're back to pulling out on land. At
that point, the advantage of a diagonal chest
zipper over a horizontal shoulder zipper
become apparent. I *really* like the
diagonal chest zipper. Can't figure out
why they're the exception rather than the
rule.
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PeteCresswell