At Stitch Fix, data scientists and A.I. become personal stylists

Professional stylists do the job for them and the personal shopping service ships the new clothes to their door. That combo is behind the success at Stitch Fix, a San Francisco-based online subscription and shopping service founded in 2011. "I think it's the single most salient aspect of our company," said Eric Colson, chief algorithms officer at Stitch Fix. "Our business is getting relevant things into the hands of our customers. This is the one thing we're going to be best in the world at. We couldn't do this with machines alone. We couldn't do this with humans alone. We're just trying to get them to combine their powers."