Final answer:
The fabric with broad, round weft threads creating a horizontal rib is corduroy, known for its durability and unique texture with 'wales'.
Step-by-step explanation:
The fabric that consists of natural or synthetic fibers woven into a medium to heavy weight with broad, round weft threads that create a horizontal rib on the surface is corduroy.
Corduroy is characterized by its unique texture with distinct ridges known as "wales", variety in wale size from fine to wide, and its durability. This fabric is often used for pants, jackets, and other types of clothing where a durable yet comfortable material is desired.
Unlike tweed which has a rough texture, herringbone which is known for its distinctive V-shaped weaving pattern, or gabardine which is a tightly woven fabric with a twill weave, corduroy stands out for its characteristic channels that run parallel to the selvage.