Heading 5809 requires that the metallic element be incorporated as yarn or thread in the weave itself—either bare metal thread or metallized yarn per heading 5605. A fabric that achieves a metallic appearance through a plastic or foil coating applied to the surface of an otherwise conventional woven base would instead fall under heading 5903 (plastic-coated textile fabrics).

Yes. The heading specifies goods 'of a kind used in apparel, as furnishing fabrics, or for similar purposes,' so purely industrial metal-thread fabrics with no apparel or furnishing application may classify elsewhere. Importers should document the intended end use when the application is ambiguous.