Just received mine yesterday. 
What shall I say? Love it - beautiful fabric and well made!
One thing I'm a bit concerned about is: SHRINKAGE…
As often I was in the middle of 2 sizes. I choose the smaller one which so far seems to be the right decision concerning the length of the arms as they definitely shouldn't be any longer.
But what if it shrinks like denim?? 
As far as I have seen, there is no information about sanforization or prewashing.
So, is anyone there who has experience if or how this fabric may shrink? If there might be reasonable shrinkage, then maybe I have to rethink my sizing…
I only will wash it at the maximum temperature that is indicated: max 40 degrees C.
I also asked the IH staff. Graham answered to me today: "[i]There should be no noticeable shrinkage if handled correctly (low temperature, low spin)".
But if there is any experience out there in the community, I would also appreciate to hear that.
Thanks guys!