I agree, gj. It makes sense to have clothes, etc manufactured in Bangladesh (or another developing country) because the cost of living is lower than in the UK.
I don't think many consumers would buy a T shirt made in the UK by workers (possibly of Bangladeshi origin) in factories where they only earn minimum wage anyway, when they could buy an identical T shirt made in Bangladesh. The consumers would end up paying more for an item made by workers earning the same pay relative to living standards.
Obviously, the UK has little control of the working conditions of factories in Bangladesh, although big companies such as M&S or Tesco could put pressure on manufacturers. Governments could also set standards for imports, so that goods comply with domestic standards, which could include working conditions
That's the way globalism and capitalism work. I don't accept that the EU has much to do with this, although the EU could use its might to put pressure on developing countries to improve working conditions.
Ironically, leaving the EU could (as some BREXIT politicians want) turn the UK into a low wage sweat shop economy with a small élite in control.