Yep, last denim I bought from JoAnne's was on a "red tag" bolt that said -- get this -- 100% cotton, professional cleaning recommended! And I'm sure it's not all cotton, has a stretch to it and curls like the dickens. It is the green stuff I made Bob's first RK XKilt from, and I had to pin the front apron closed for the pix I posted

I'm going to try ironing a heavy interfacing onto a scrap, see if that defeats the curl -- if not, I'm going to add a self-liner to the front apron, let the two curls battle it out. Adds another level of "reverse" meaning to the RK!