The difficulty with JIT/data-driven logistics in this context is that Stitch Fix's styled offering (the "Fix" boxes) all has to be fulfilled from a single distribution center. So you need not only to predict demand for particular articles of clothing but to ensure that there's sufficient inventory of items to go along with them. It's easy to get people to buy one piece and return four, but does that sound more like a "personal styling service" or a subscription box?