Traditionally, yoga clothing is made from knit fabric using cotton, bamboo, nylon or polyester, along with lycra (spandex) for stretch and shape retention. There is no right or wrong fabric as long as it enables maximum movement and is comfortable. Fabric is mostly a personal preference.
Natural Fibers: Many people choose organic cotton, bamboo or other natural fibers because the fabric is more comfortable due to its breath-ability and hypoallergenic nature. Natural fiber garments tend to transition out of the yoga studio better than made-made fibers. With the increase in chemical sensitivity, some people feel uncomfortable in, or are allergic to, man-made synthetic fibers such as nylon or polyester.
Man-Made Fibers: If you sweat significantly during yoga and are concerned about sweat spots, you may want to choose nylon or polyester with moisture management. The moisture management enables the sweat to be wicked off the skin and escape to the outer surface of the garment for fast evaporation.