What they all said.
Fran- you HAVE to do the haka wearing this, including all the face pulling and chest slapping, it's essential. Mainly though, the outrageously huge square skirt makes you want to stick your knees out sideways and pretend to be a table.
That's my story anyway.
I definitely would not recommend making the bodice in a woven, unless utterly boobless, it simply wouldn't work. In jersey, you don't need a zip either.
If you don't want to self line, you could use a thinner fabric to line [as long as it is as stretchy], or fiddle about making facings. Thinking about it, you DO need the two layers, because that skirt is HEAVY, and a single jersey layer would probably go all doo-lally.
Make it make it make it it's a fab dress especially if you add pockets