Canvas is different from other fabrics because it has no front or back. This is the result of a particular weaving method that alternately crosses the odd and even warp threads, to let the weft thread through.
Flannel
Flannel is combed wool or cotton fabric, which appeared in the 18th century coinciding with the introduction of the first looms. An imperishable classic in English drapery, this warm fabric with a slight fuzz (due to washing at the end of the production process) permits the elegant man to face the winter months without shivering.