Which handkerchiefs and bandanas are plastic-free in the cloth, the hem thread and the print?

A square of cotton looks like the simplest textile there is, which is why the plastic gets missed. The cloth is cotton or linen, though 65/35 polyester-cotton squares and polyester neck gaiters sell under the same names. The hem is sewn in polyester thread unless the maker says cotton. A printed bandana carries pigment ink, and the binder that fixes pigment to cloth is an acrylic or polyurethane polymer. A vat dye such as indigo bonds to the fiber with no binder at all. The label is a polyester tag. The square often ships folded in a polybag.