In adopting the black outfit the Black Bloc has made themselves easier to single out. What about doing something a little more sophisticated like, say, everyone wears jeans and sneakers and rolls a die to choose : Baseball cap, bandana, t-shirt color. Limit the garb to a small set of colors. red white blue green yellow black If it becomes clear that automated techniques are being used to study regions of an image, up the list of colors. Wear a secondary shirt color under the first. Use a 7-Eleven cellphone in a baggie to keep saliva off. Use sounds to coordinate movements. Sounds are tough to pinpoint in a crowd and it's tough to prove who whistled or whose airhorn was dropped on the street. Want to intimidate? An entire crowd chanting some 3-word slogan in unison is probably as scary as the black outfit. Let's see observers identify the presence or location of the group, assign membership to a particular person or track a subgroup through a crowd. Who's going to get three colors correct during a pursuit when those colors can be lost or changed on the fly? A single color is not so anonymous.