Why was silk valuable in ancient times?

Silk is an expensive material that was valuable in antiquity. He got his popularity for a reason. It turns out that silk has amazing properties: elasticity, softness (pleasant to the body), breathability, and hygiene. People also believed that the tissue stimulates metabolic processes, therefore, affects the condition of the skin. Silk was a natural and expensive material, it was bought only by representatives of the upper social classes.
Today silk fabrics are used for sewing clothes and home decor.