"Flannel is a soft woven fabric, of various fineness. Flannel was originally made from carded wool or worsted yarn, but is now often made from either ...
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wool, cotton, or synthetic fiber. Flannel is commonly used to make tartan clothing, blankets, bed sheets, and sleepwear.
Flannel may be brushed to create extra softness or remain unbrushed. Brushing is a mechanical process wherein a fine metal brush rubs the fabric to raise fine fibres from the loosely spun yarns to form a nap on one or both sides. If the flannel is not napped, it gains its softness through the loosely spun yarn in its woven form." - (en.wikipedia.org 13.02.2022)