Doesn't the textile industry use a lot of water?

Yup. In fact, the average conventionally grown cotton t-shirt uses around 2,700L of water from farm to finish. That's near enough to quench the thirst of an averagely thirsty human for 3 years.

We've heard a lot of chatter that organic cotton can use the same amount of water as the plain old, soil-degrading, pesticide-consuming kind can. That may be true, but only for the first 1-2 crop rotations. After that, the soil becomes much better at retaining water (using around 30% less water than conventional) and is generally in better condition due to its superior ability to store carbon. In fact, of all the organic cotton farms in the world, 70-80% of those farms rely on rainwater alone. So growing organic cotton really makes a difference.