Flannel is a type of fabric which is made from plain and twill weave commonly with carded yarns. Most of the time flannel is napped from the both sides to clears its twill weaves. The more flannel is napped the more it will be delicate. Use of flannel fabric determines its degree of napping and fibre composition. Comparatively it is a warm fabric because of its napping it contains still air in it which protects the fresh and cold air flow through fibres.
Use of synthetic fibre in its composition adds durability and resistance to its abrasion therefore it may cause a lighter effect in the fabric life. Moreover use of synthetic can also determine its fine finishing and inflexibility which make sure a perfect fit. Some fibres as acrylic fibre, when used in its composition, enhance its crease retention.
For casual wearing wool, wool blended fibres or synthetic fibres made from even twill- weave. Most splendid and delicate formal dresses are tailored from 100% wool flannel fabrics. Blending a man-made fibre gives the advantage that it prevents felting shrinkage and produced easily washables man’s suiting. These blends can be of wool with acrylic, polyester, nylon etc.
Most widely used flannels are cotton flannels which are produced by using soft spun filling yarns. There are many kinds of cotton flannel i,e suede and flannelette. Suede is an extremely short and compact nap treated fabric having very flat and smooth texture and flannelette is a light weight soft fabric having twill weave and nap from both sides.

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