You're right about the striping. What I was thinking of was the pillow casing - the striped "ticking" as we call it. This little newsletter article specifically says "pillowcase," so maybe the Mutter does have one. Wasn't it the GAR of Philadelphia that was considering letting a piece of a blood-stained pillowcase that they own be tested for DNA to satisfy Dr. Sotos? Maybe they have given that to Mutter?