It would wind up being a "winter only" hammock. If you want to spend extra money on an hammock that's also a vapor barrier, that's your look out.
However, I prefer my hammocks to be usable year-round. This is why my vapor barriers are removable (I use a poncho/undercover and a space blanket as under insulation during 50* to 70* F; it works as semi-dead airspace and a good wind-blown rain block for the hammock) and further away than the body of the hammock. I would not enjoy lying in a sil (or other vapor barrier) hammock warmer than ~70* F, as I would definitely wake up in a pool of sweat.
The best material for the hammock (in terms of weight/cost/strength) is lightweight uncoated nylon. Lightweight uncoated polyester is good, too, but tends to be a smidge heavier for the same strength (read: "weight rating"). I would avoid coated anything for the hammock body; if you want vapor barriers as a part of your system, make 'em removable.
Hope it helps!
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