Actually, I think that I disagree with a lot of people here on this... If a muslim group were to try to "outlaw" shorts in gym class, then I can understand the outrage. However, it's a matter of modesty, and it really should have been much simpler to solve, simply by saying that the girl could wear sweat pants to gym class.
I think that this is a big deal made by people who are looking for something to get outraged about.
Mark