Yes I take your fair points. Pollution is a huge problem. Storage of waste chemicals is sometimes non existent in some factories and something must be done. I know that last part sounded a bit casual but it's absolutely urgent.
My concern is though if we in the west were to stop buying cheap clothing, made in the third world, then what of the knock-on effects to people, [mainly women] who work in this industry in these factories? They often get to leave behind rural existences, and the concomitant grinding poverty, arranged marriages, in them, for the better paid work that can be found in manufacturing in cities.
In Michael Shellenberger's book 'Apocalypse Never', he cites the example of a young Bangladeshi woman, that he spends time with, named Suharti. Her experience has been exactly that. She got out of a harsh, high mortality, rural existence, back breaking toil and so on, for work in the city, making at first trainers and then to another factory - making jeans. She now owns her own home, has a scooter, a flat screen TV, has a boyfriend and a life she'd never have had if she'd stayed put, where at best she faced a future of being an illiterate baby machine. The unintended consequences of how we go about addressing environmental matters - in particular what matters to us here in the wealthy west is worth very careful consideration.