Thirteen years after Rana Plaza, the lesson we're still wearing.

On the morning of 24 April 2013, thousands of garment workers in Dhaka were ordered back into a building they knew was unsafe. The cracks had appeared the day before — long, unmistakable fractures running up the walls of Rana Plaza. The bank and the shops on the lower floors had closed. The garment factories on the upper floors did not. Workers were told their pay would be docked, or worse, if they refused to stitch. Within hours, the eight-storey building pancaked into rubble.

One thousand, one hundred and thirty-four people were killed. More than two thousand five hundred were injured, many of them permanently. Most were young women. They were making clothes for brands whose names you know — the ones on the hangers in your wardrobe.

Here is the detail that should stop all of us in our tracks: the factories inside Rana Plaza had been audited. Social compliance checks had been carried out. The paperwork said the system was working. The workers said the building was about to fall down. One of those accounts was true. We know which one.

How does this happen? How does a building collapse surprise no one who worked inside it, yet surprise every brand sourcing from it? How does an auditor walk a factory floor and miss the thing a sewing machine operator can see from her workstation? The answer is uncomfortable. Audits were designed to reassure buyers, not to protect workers. They measured what was easy to measure and asked the people who had the least to lose. The voices that mattered, the women watching the walls crack, were the ones the system was built to ignore.

Rana Plaza forced something open. After 24 April 2013, it stopped being acceptable for a company to shrug and say it didn't know where its products came from. The Accord on Fire and Building Safety put real engineers into real factories. Modern slavery legislation followed in the United Kingdom, in Australia, and elsewhere. Transparency moved from a nice-to-have to a baseline expectation. Much of what we now call responsible sourcing is built, quite literally, on that rubble.

But sit with that sentence for a moment. Built on that rubble. Every reform we point to is a headstone. The fashion industry did not choose to change in time. It changed because one thousand, one hundred and thirty-four people were crushed to death while stitching the clothes we were about to buy.

Today we know that cotton grown in the Xinjiang Uyghur Autonomous Region of China, roughly one in five cotton garments sold globally, is tied to the forced labour of Uyghur people. We know about transfer programs, surveillance, and factories where workers cannot refuse and cannot leave. The pattern is painfully familiar. Workers who cannot speak freely. Audits that cannot see clearly. Brands that will, when the reckoning comes, say they didn't know.

So the question on this anniversary is not only what the fashion industry has learned. It is what the rest of us have. Because the people who make our clothes are not served by CEOs alone. They are served (or failed) by every one of us who pulls a $5 T-shirt off a rack and chooses not to wonder how. The brands will keep selling what we keep buying. Governments will regulate as far as voters push them. The next Rana Plaza will not be prevented by a sustainability report. It will be prevented by a generation of shoppers, workers, lawmakers, and executives who decide, together, that a human life is worth more than the margin on a T-shirt.

The cracks are already showing. Someone is telling us. The only question is whether, this time, we listen.