For yoga practice, light breathable clothing is certainly recommended (especially in hot yoga sessions!). Consider clothing made from stretchier breathable materials such as nylon, polyester, bamboo, spandex and polypropylene. These materials will allow your skin to breathe and not soak up the sweat. Avoid cotton at all costs, it will leave you drenched as though you’ve just emerged from a pond.
As well as breathable, consider tighter fitting clothing that stays in place and isn’t too revealing. This is important as some of the positions required may leave you exposed! If tighter pants or shorts aren’t your thing, look for jogging pants with elastic around the ankles. The ankle elastic will ensure they stay in place throughout your practice.