I may be off base here but I believe that all cotton will shrink that is 100% cotton. I am 66 yrs. old and grew up wearing a LOT of cotton feed-sack dresses, etc...and remember that we always knew that anything made of cotton was going to shrink. I think that's why they started added the polyester to the fabric-mix...to cut down on the shrinkage. . . and some of that might shrink to some degree.