THIS. is what I've been searching for! I knew that cattail had potential to be spun! I have scads of it broken down into material I can make cottage with, but my ultimate goal was to spin it and make clothing. All I did was split it, dry it, rewet it, and then make cordage. Then I used it for weaving or basket making. But I would love to make a nice linen fabric. I'm keeping an eye on this thread so I can learn more. We have cattail in abundance, but it's a cleaner of water sources. We also have invasive blackberry bushes everywhere. The fiber from the blackberries makes great footage and rope, but it's real rough. Maybe I can find a way to soften it.
Link to my first attempt at weaving something with catrail:
https://www.tiktok.com/t/ZP86VV4bd/
I have made a watchband, and plenty of baskets. Cattail gets brittle. I even ran the stuff green over my wool carders and shredded it up close to what flax would look like for spinning, but it won't stay together for spinning on a spinning wheel. It slides apart and won't stay a string. I guess with flax you use water to help it stay glued together.
I am learning, but by bit, as I find little nuggets like this hidden away on the Internet, of the beaten path. So I will try boiling the cattail. Maybe something like that will work in the fibrous blackberry vines, too. BlackBerry is a lot more work to harvest, though.