I had read about rain kilts and I like the design of the multi-use Cloud Kilt by ZPacks, but I wanted to try the concept before buying one. So I cut the bottom off of a 30 gallon drawstringed trashbag and tried it out yesterday on some moderate terrain in western North Carolina. The weather was 45 degF, windy, and steady light rain. I wore spandex shorts, a Patagonia Cap 2 zip T-neck, a 100-weight fleece beanie, a visored cap and a Marmot hard shell top. I can't remember the model of that shell but it weighs 8 ounces in an XL. Definitely thinner and lighter than the PreCip.
The kilt worked perfectly. My hips and upper legs stayed quite dry. Of course the ventilation was great. Interestingly though, the kilt retained just enough heat to make the crummy weather quite comfortable without further insulation. I experimented by hiking up the kilt and immediately felt the windy chill. Of course this is to be expected but I did not expect that wide open 'skirt' to block as much wind and retain the heat that it did.
I have the build and metabolism that does well in the cold; where a lot of people get chilled I do OK. So I suppose that helps the kilt work for me.
I ordered the Cloud Kilt last night. With the tieout tabs that are sewn on it, I expect it could be jury-rigged pretty well as a tarp door. Plus it can be used as a ground sheet extension.