It started with a Kickstarter campaign earlier this spring. The Planet Money team sold 25,000 t-shirts (just plain ‘ole shirts made by Jockey) and then tracked the creation of that shirt all around the world — from the cotton seed to the end product.
The reporting, the short videos, the writing — the whole website — is extremely well done. This is definitely worth reading through and watching all the videos. I’d start with the Kickstarter video, since that sets the stage for the final product.