I just made cafe curtains solid brown fabric, not Knoa brand.. Fabric was from Jo-Ann, the quilters cotton, and it was a nice cotton. Instead of washing it in one big piece like I always do, was about 7 yards. I cut it close to my length for each panel, I had four. Squared each one, leaving extra. When I went to re iron and straighten selvedges, they were really off (uneven on each end by a lot )
I'd say I lost a inch from shrinkage,and a lot more by cutting first.I used Knoa brand for a bed ruffle.And I'd still feel safe saying shrinkage one or two inches.