Quality control is the most critical part of garment factory. Clothes are cut from the production line, and then they are qc first. Each QC has its own number affixed to the trademark. Then there is the general inspection. Setting up several QCs is the factory's own arrangement. What I said is the simplest. If qc is unqualified, return it for rework. The pressure is not great, mainly because the details are complicated, so you can exercise yourself properly.