HELP!!!!!!!!!!

Im am gettig so frustrated. Im having 7 chambelanes, and no damas. But, would it be ok, if i had 6 chambelanes and my courte de honor? i wanted to have 7 damas, but we dont have enough money to get dresses for them. Any advice on that? or, would there be a way to kinda do the girls casual, but not too casual. My guys arent wearing tux`s, they r just gunna wear a nice white shirt, black tie, and black slacks. I want to have damas too, cuz this is the 1st quincenera my abuela has had in her family, and when she had hers in cuba, it was a big deal, so...... HELP!!!!!!!!!