Don't believe the Iranian state propaganda.

Here is a more accurate version of events (with a team photo):

http://www.washingtonpost.com/sports/united/olympics-2012-fifa-bans-head...

Then women were not banned. They were disqualified in ONE match against Jordan. They were told ahead of time (in fact, the history of this dates back two years).

I'm not saying I agree with the decision. Personally, the photo in this linked story above does not lead me to think that anything the women are wearing is inappropriate for the pitch.