How about a wearable mirror angled kind of left of your HA and it reflects your HA!?
Example: (Super rough draft) [IMG]http://i61.photobucket.com/albums/h62/little_stereofuck/SubetaMirror.jpg[/IMG]
This is a cool idea, but I'm not sure it would be possible. Wearables are just essentially images that we layer on top of each other. HAs are like paper dolls, and I'm not sure it would be possible to get a reflection effect that actually reflected what your HA looked like at the time, it would have to have some sort of pre-set image.