How to do Quality Controlling in Garments, cosmetics & perfumes?

Here's a simplified response:

1) Begin by learning about the products and services; gain domain knowledge
2) Understand workflow and processes throughout the product life cycles
3) Determine where defects are caused in these workflows and processes
4) Establish checkpoints at these junctures
5) Establish reliable methods of defect detection 
6) Establish quality standards and targets for quality improvement
7) Tie Quality Control effort to organization's cost and profitability 
8) Report findings