April 23, 2008 will be the 10th annual "Denim Day" to educate the public about sexual assault. 
In 98, a man sexually assaulted a girl, and told the court that he did so because of her tight jeans. The jury agreed with him,(everyone on that jury were dumbasses). So to speak out against this horrendous act and the jury's poor judgement, people are encouraged to wear jeans (tight ones ;) ) and support Denim Day in LA. And who cares if you don't live in LA, support a good cause.
Search "Denim Day in LA" for more detailed information.