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.