My mother worked till the 80s in the textile industry (until what remained of it vamoosed overseas), mostly as a lockstitcher, but I think she did a bit of everything, for stuff that was sold in places like BHS and C&A (remember those). It meant I grew up wearing wonky seconds. It wasn't great in the UK, low-paid piecework, long hours, poor occupational health, her fingers are messed up with arthritis. So if it was like that in the UK, it doesn't take much imagination to imagine what's it's like in Bangladesh or somewhere similar, making clothes that only retail for a few pounds in the developed world.