It's important that your response show that you take responsibility and are willing and able to learn from your mistakes. You'll win over the interviewer if you show humility and a proactive approach to the situation.

Example Answer: "Before taking this mistake to my boss, I'd look very carefully at what I did wrong. I'd ask myself, is there any way to save this? What could I have done differently to avoid this? At what stage could I still have saved the garment?

Then I would take the garment to my boss and apologize for wasting time and money. I'd suggest that we try to sell it as an irregular or put it in a sample sale."