A poncho isn't going to work brushwacking, even if made from 4oz SuperKCoat ripstop.
Realistically for crawling through rain soaked brush, staying dry isn't going to happen.
Using a layer of fleece under a uncoated heavy duty ripstop jacket and pants might be the best bet. Yep it will get wet from a combo of sweat and drip/rain but once you emerge from the brush body heat will eventually dry the fleece.
Crawling through north Cascades brush in $1500 worth of "dead bird" goretex outerwear seems like a pretty expensive choice.
The only thing that matters is you gotta sowe a layer of jeans in. In between 2 layers of rain coat there needs to be a Jean layer. Need a layer of jeans in between the coat layers!! Need to sowe the Jeans in.
FWIW: This is the poncho/tarp I'm currently using.
Works nicely in open country and on maintained trails. Brushwhacking -- terrible idea.
If you are to crawl through rain soaked brush -- I think it is neccsary to accept that you are going to get wet. I choose to wear inexpense, but durable jackets and pants over the minimum base layers needed and keep a second set of base layers in a dry bag in my pack.
I was doing some ski trail work this fall using a "construction worker" rain jacket and pants over thin base layers. It rained 1.5 inches than day and I was sweating preatty good cutting branches and brush that had grown into the trail. Yeah I got soaked -- but I then changed into dry layers once I got under cover.
The hard thing to do on a multi-day trip is put the wet layers back on in the morning.
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