Wow. A somewhat old thread re-surfaces...
Here are two polls which touch on the hakama subject:
"Do you think everyone, regardless of gender and rank, should wear a hakama in aikido?"
http://www.aikiweb.com/polls/results.html?poll_id=21
"What do you think of wearing a hakama during aikido training?"
http://www.aikiweb.com/polls/results.html?poll_id=165
-- Jun