Fibres can be described as long, thin strands or fiaments, which can be woven together to make yarn in case of clothing.

BUT Fabrics are befined as the textile or texture of a cloth material.

I hope you will give my answer as the best one.
Fibre is what makes the fabric, fabric is woven material.
Fibres are what fabric is made out of. The fibres can be plant, as in cotton and linen or animal, as in wool, insect, as in silk or man made, as in nylon. For the manufacture of fabric the fibre is first spun into thread or yarn, and then woven into cloth.