The texture of fabrics is influenced by the fibers (silk, cotton, linen, man-made fiber, wool), the thickness of the yarns, and the style of weaving or knitting of the yarns. Like paper, fabrics can be as thin as tissue or as thick as chipboard. For fabrics with a soft handfeel but without a pattern, the texture of the fabric itself is what creates to character of the textile.
The thinner the yarn, the looser the weave - the more light comes through. The thicker the yarn, the denser the weave - the more warmth it captures.