I mean we can also make long lasting clothes out of natural fibers without hurting animals.

You can indeed. But growing cotton has already resulted in environmental changes beyond my comprehension.

I guess the first step should be to adapt a habit of clothes repair

Growing cattle has also had a massive impact on the environment. And you often need more land for animal based materials because you both need land for the animals and the land to grow food for the animals. With cotton at least you just need land for the cotton.

I dare you to travel to Uzbekistan and see for yourself what’s needed to grow cotton for the whole region.

Then maybe not cotton and instead hemp