Make Your Own Buttons! One person commented about using plastic instead of cardboard for the base so they would be washable; be sure the edges are smooth though, so the yarn doesn't get cut by the plastic as garment is buttoned.
Woman size charts from XS to 5X. Site also has measuements, for infants, children/youth, men, hat circumference, and foot size. There is lots of information for knitting and sewing, plus 2 methods of printing chart. I dont think this in in my knitting books.