I did not see Bill saying that everyone had to dress the same way. I think it's important that there is some control though as without that it just becomes a rabble and does not achieve it's objective which is to raise attention for the victims and put pressure on the WTS. This is an official demonstration / march and Bill has organised it. Of course people can't just turn up and put whatever they like on banners - that's rediculous and just undermines the whole thing.
As for you not going on the march but going to Philedelphia to press charges ... perhaps I have just been conned too many times and am overly suspicious (so please don't take offence) but is this really necessary? Can this not be done locally or by phone or fax?