cord

Preferred label: 

A material made by twisting together twisted strands of vegetable fibres to provide a material of a thickness suitable for either a sewing support or endband core, the former often being referred to as sewing cords. Cord is typically made from a variety of bast fibres the most common of which on early bindings will be jute, flax (linen) and hemp.

AAT

The Arts and Architecture Thesaurus Online, The Getty Research Institute.

Additional reference: 
http://vocab.getty.edu/aat/300014247 (modified)
Hierarchy: 
Broader concept: 
Top concept: 
materials