Let me add that in a survival situation you may wish to remain unobserved whether you are holed up or moving. Inherently quiet clothing and gear, as well as camoflague and good woodcraft, would seem to be a good idea.

I was watching a deer move along here and there from my tarp- wrapped sleeping bag, I was also wearing my jacket because I was cold. When the deer wandered out of my window of vision I tried to roll over to be able to follow - instant scrape and crinkle that sent the deer bounding away. I spent an eye- and ear-opening day noticing how loud my gear was as I hiked and did camp chores.

OTOH, in most survival situations you might want to be as observable as possible.

I'm thinking the ability to choose whether you are highly observable, or not, is the way to go. The signaling gear we carry, including fire-making gear, mirrors, etcetera, should be designed / selected appropriately.

I was going to mention Cabela's as well, I got their rifle/bow pack as my all around, the material is water resistant, snag resistant, and quiet.

And I know they make a bunch of clothing out of similar materials

Ninja rolls into discussion.
I went on a Audoban Society walk yesterday.
I kept thinking of an old anecdote about Walt Disney. Whenever he visited the studios, people would whisper 'Man in the forest' to alert fellow employees of his presence.
I was dressed in vintage tweeds( it does get cold here)and one wag asked if I was fond of J.R.R. Tolkien? I replied I was a C.S. Lewis man myself and couldn't wait for the new movie's premier.
The group looked like a Rambo convention with a few Power Rangers and one Buckskinner thrown in, all with 75 lb daypacks.
In between sneezing from 3 distinct colognes, I observed HOW CLEAN the clothing was and how those brighteners would flare up in the superior vision of many wild animals.
I was dawdling as usual, ignoring the march or die regimen of our Rosie O'Donnellesq group leader.But hey, I had my PSK and a wrapped fruitcake and full bottle of Perier) I was bent over looking at a native plant I haven't seen in years when there were shrieks and the sound of crashing.
5 deer came bounding down.
They paused right next to me, making like an ENT ( I did read LOTR)with my hand frozen on my custom survival hiking staff
( it has a wood spirit's beard smiling face carved on the top for good mojo.)Then they walked cautiously on, close enough I could have touched every one.
I added to my lifetime bird talley; a few dozen more LGBs( binomial nomenclature little,grey birdies.)
You want quiet? wool,with the BAAAA carded out.

The attractions of fruitcake are well documented.

And wool does stay warm, though it gets a bit heavy, after lengthy heavy rain or thick fog.

I tend to wear cotton in the warmest weather, then wool-cotton or wool-poly blends in the shoulder seasons. But my jackets, tents, and tarps are all synthetic all the time - that's what I would like to look at changing.

I am actually looking at traditionally tanned buckskin for clothing. The smoke cure supposedly acts to make the material highly water resistant, it remains breathable, super quiet, etc. Unlike chemically tanned buckskin, traditionally dressed and smoked bucksin supposedly shrugs off the occasional soaking and returns to its original state. But making it is labor-intensive and buying it is expensive, then there's the tailoring. It does have a scent of its own when new.

So, any other candidates?

Thanks.

Indeed, the first rule of not being seen is not to stand up as described in the HM Government Public Service Films Number 42 - How not to been seen.

I have seen some clothing meant for turkey hunting that was quite soft, quiet, and reputedly waterproof, etcetera, but have never seen that material made up into tarps, tents, sleeping bags, etcetera.

Supplex nylon is a little quieter and has a more cotton-like feel than the typical outdoor nylon fabrics.

Some polyester fabric is quiet, but not very durable.

Tighter clothing made for runners and cross-country skiers might be worth investigating.

As already mentioned, fleece and wool are very quiet.

You could sew patches of quiet material such as leather onto areas of clothing which often make rubbing noise.

This may cause more questions than answers, but here goes. . .

I own a light weight zip front hooded jacket similar to THIS ONE from Harley Davidson.

It is made of a very short "nap or pile" polyester fleece and has a laminated backing. It is both wind and water proof as I have repeatedly tested both normally around town and on my motorcycle. It seems to breath well enough. I don't know for sure but I think it is GoreTex WindStopper.

Amazingly QUIET, so if one could find other items from this cloth it should work.

It has one major downside. If you come within 50 yards of an animal that is shedding, ALL of the loose hair will be stuck to the garment. YMMV