Wearables are anything and everything mobile that's moved from a more traditional phone to something you wear on your body. Maybe it's a watch. Or glasses. Or something built into clothing. Or in your shoe or sock. And, yes, even in your underwear.
There's really no limit to what a wearable can be, so long as it's somewhere on your person. For more on wearables, see:
And you can find even more at Connectedly.com.