Not only would a hi-vis vest show ownership and responsibility for drone operations, it would also promote a professional image, and make the public more aware of when a drone operation is in progress.
Spark Aerial Kickstarter project aims to build an Aerial Cinematography video training series and accompanying online resource center for anyone interested in aerial filming. The free video training series (with some premium content) is intended to emphasize flight safety, and would move from such basics as taking off for the first time to advanced piloting maneuvers like the buttonhook sweep, which enables a video camera to remain focused on one place while the drone circles around.
As drones become more ubiquitous, their safety systems are becoming increasingly important. One company that understands this issue, and is which is making constant progress in UAV safety systems, is DJI Innovations.