How can cotton fabric be made warmer?

Make the structure of the fabric contain more air. Make the fabric thicker. Add layers (either separated layers or part of the structure/weave). Coat it with an insulating nano-material. Line it with an insulating material. Light it on fire. read more

Flannel is a knitted fabric that is typically 100 percent cotton or a blend of various fabrics. Cotton and loose wool or wool and synthetic blends provide light and medium weights of flannel fabrics. It is a thin fabric, reducing bulk and allowing for ease of layering garments. read more

Damp or wet cotton also takes a very long time to dry and can be uncomfortable to wear when someone is sweating due to the heat or when they get wet due to snow. Polyester, however, is a suitable fabric to wear on both warm and cool days. read more