I think if I used Ventile garments the first thing I'd do would be to Nikwax it. I'm very trigger happy with the Nikwax anyway because even things it can't waterproof dry quicker. I know one can buy dedicated Ventile proofing fluid but I suspect Nikwax is at least as good.
The quotes below seem reasonable to me:
"Ventile" is "Ventile cotton," a tough but soft material made from long-staple cotton. Once upon a time it was very common in outdoor clothing. During the '70s and into the early '80s, my main outdoor shell was an REI-bought jacket made from Ventile cotton.
Ventile's chief attributes are its soft hand, windproof quality, and high breathability. It works great in cool-to-cold, dry conditions. It's also fine when it's cold and snowy out. But it works less well when it's raining, for instance. The stuff has good water repellency, but in time it will start to absorb water. When that happens, a jacket made of Ventile quickly becomes a heavy, soggy mess that can take days to dry. I used to joke that my Ventile jacket had the water repellency of a sponge: Meaning, it could absorb only so much.
Anyway, in the U.S., Gore-Tex pretty much killed off Ventile, even though Gore-Tex is more expensive, less durable, and less breathable. But, people went for its superior waterproofing (myself included). Ventile has remained moderately popular in the UK, and some makers can be found there via the Internet (try
www.west-winds.co.uk to see some lovely but wildly expensive Ventile pieces). At present, I'm not aware of any U.S. gear makers who still make products using Ventile.
Is Ventile worth the money? That's hard to say. But you're probably looking at $300 and upmaybe way upand for that kind of scratch you can find some pretty nice jackets made from other materials. But the stuff is comfortable and versatile, so there's that to consider.
and
The excitement went out of Ventile over here when the gov't created testing standards for "waterproof" and Ventile failed miserably. Devoid of the ability to even call itself "waterproof," it disappeared pretty fast.
Now there are texturized nylons that hold water repellant chemicals as well as cotton ever did. Not much interest in them either -- not "waterproof."
Still that melting problem, but I've had one hole in 25 years of nylon and polyester (pine wood fire %^$&#!!).
On the plus side, nylon and polyester are both much more abbrasion-resistant than cotton.
Back to the minus side, Gore-tex stops breathing when the outside gets wet as the vapor pressure can't overcome the film strength of the water --might as well be wearing "oilskin." This can be overcome to some extent by designing ventilation into the garment. .
There's a discussion of Ventile
here that is particularly interesting to me as like the querent I am very partial to Buffalo stuff. If I had any interest in going Ventile it would not be to put it at loggerheads with Gore-tex because to my mind Gore-tex is clearly vastly superior to it in the wet. It would be to put Ventile against my Buffalo systems or soft shell X. Despite never having had a problem with any Buffalo gear after years of usage it strikes me as obvious that Ventile would beat it at bramble-proof and would be a lot harder to catch fire to. That matters little to me especially when offset against drying and weight, but if under different circumstances my priorities may be very different.