The WCCTV 3G Covert Backpack makes a great surveillance vest. The feed from the attached camera can be sent wirelessly.
A 3G mobile phone can also send images, as well as sounds, to a local compact flash writer - this also can be accessed remotely.
And any item of apparel that includes a panic button receives my covert approval.
I was thinking about the cool surveillance gear worn by the gomers from Earth, David Brin's 1990's novel about the near-future.
Read more about True-Vu lenses and sonomagnetic fabric.