...This year, I spoke with more than 30 company reps, factory auditors and researchers and read dozens of studies describing what has happened in those sweatshops since they became a cultural fixation three decades ago. All these sources led me to the same conclusion: Boycotts have failed. Our clothes are being made in ways that advocacy campaigns can’t affect and in places they can’t reach. So how are we going to stop sweatshops now?...