see the explanation of textile process on the reference site.

BUT if this ~{Lu~} mean something that is in the stage ready to be woven in to fabric, it should be called "yarn".
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Cotton is produced by small trees ... The immature flower bud, called a square, blossoms and develops into an oval boll that splits open at maturity, revealing a mass of long white seed hairs, called lint ... The length of the individual fibers ranges from 1.3 to 6 cm (0.5 to 2.5 in). Shorter fibers that grow from the seeds are called linters.
Natural fibers have a finite length, referred to as staple length.
..staple fibers must be carded to combine the fibers into a continuous ropelike form, combed to straighten the long fibers, and drawn out into continuous strands,