Not quite a wearable …
This article indicates some of the “wearable” peripherals that are showing up. This one is a kit that adds a wearable half-keyboard and other “mounting” straps for wearing your Palm device. I’m not in agreement that this “competes with industrial PCs”, however it is demonstrating the “fashion” that is beginning to appear.

Palm Becomes Wearable. Kit competes with wearable industrial PCs [allNetDevices Wireless News]