Not the point
Not interested in the Gartner debate. Unfortunately, the wearables area is still in its infancy which means that the real market boundaries are not well defined (is it an item of jewllery/fashion or is it a business enabler? And of course, with major players unrecognized, no standards exist for the organisation, storage or transmission.
That is all very well, but please don't ignore the bio wristband from Canadian outfit Nymi. As well as access control, they are majoring in persistent authentication, ideal for mature IoT applications (no conflict of interest/association).