The Aral Sea, a place I have visited, was dried up by digging to redirect rivers that filled it to irrigate crops.

Now, let's say they made tshirts instead by pulling the water out of those rivers. They'd make the tshirt, and dump the dirty water. That dirty water would then get cleaned, evaporate and rain into the soil or rivers, or get dumped into a river directly.

Maybe you meant "potable water." Using potable water for tshirts is good - not bad. After making the tshirt, the water is no longer clean. You can't make more tshirts with it, you can't shower with it, you can't drink it. Just like the water in lake michigan where my city gets its water from.

When we need 2700 liters of water per tshirt, we need to make more potable water from the lake. We build bigger industrial cleaning systems. They are more efficient, and the water becomes cheaper. That factory that paid for the extra water, helped pay for those cleaning systems, and made the water cheaper for people.

Now, here's the biggest lie made of eco-spin strawman. The 2700 liters. Most of that is to water the cotton plants, so they can pull carbon out of the atmosphere and give us that sweet oxygen and stop global warming. Are you saying that growing plants is bad because it uses water? Well, let's cut down the rainforest then!! That's a lot more plants than the tshirt water.

As far as pesticides... We're not eating the tshirts buddy. "Pesticide use" is bad because it gets into our food. It's not bad on its own. You know what else kills insects? A bar of soap. If you stop showering you'll save the insects and the water.