I've yet to find the "perfect" raingear. Or even much that lives up to it's "breathability" hype. All kinds work better in some situations than in others.
One other thing to consider is the underlayments.
I have a couple pairs of thin nylon "river-runner" pants that I often wear hunting. I often don't even wear bottom raingear with these things when hiking/backpacking in wet. They are cool in hot, and do OK in cool/wet, and dry very quickly when the wet stops. While hiking, I'm working hard enough that I usually stay warm (with topside raingear on). When I stop, or the rain does, those nylon bottoms dry very quickly, but while wet, act much like wet-suit material. Wind or fresh vegetation brushing against them is at least momentarily cold. On longer stops, I might change out of them, or don a pair of fleece or breathable raingear over them - whatever to stay warm until they dry from body heat or hung in the wind - it doesn't take very long.
I've not used silk underlayments- but it sounds like it works much like the nylon- maybe better, but more expensive.
The Rivers West pants worked well over the light nylon (which ain't worth a crap in nettles or Devil's Club!) on two different hunts in wet when I started to get a little chilled. I don't mind warm wet much (I've NEVER found a way to ALWAYS stay dry when actively hunting/hiking), but cold wet really sucks!
And as I previously posted, I've found "breathable" raingear to not live up to it's hype, and to be quite expensive to boot. Yes, I use it in some circumstances, and still buy it, but if I want to stay dry from the outside, especially on a multi-day hunt it's going to be some sort of impervious stuff!
You won't find commercial fishermen using "breathable" gear, nor Yuppies using anything but. We working hunters and hikers in semi-severe situations are somewhere in between. We are often going from bust-ass to dead still in weather from foggy to intermittant showers, to downpours with wind. We don't have the option of going into a heated fishing boat cabin to take off our raingear (BTDT), or "holding up" under shelter, camping early, or reducing our activity level to where the breathable stuff can handle the moisture- assuming the outer layer "waterproofing" doesn't give up the goast a few days into the hunt (You can carry extra Scotch-Guard or some such for this near eventuality).
Well, I suppose we do have the mentioned options the Yuppies employ - but where's the fun in that????
We ain't got nothing that works perfectly all the time.
Dammit.
So buy some of everything and try to match the hatch.
Youse is gonna get wet!