I use a lot of different fabrics for my project Linus quilts because we try to use the fabrics we're given before we get into our own. Just remember that cotton may shrink and anything with polyester will not. Of course,t hese have probably been washed a lot and if they've been dried, they won't shrink any more. I wouldn't use any rayon because it does not wash and dry well. If you use the turtle necks knits, just put a light weight stabilizer on it before you cut. What a special gift for you and your friend's family.