I haven't met her before and want to portray the right image.
I don't want to go in all business suit and heels (DH will be in his work suit), and track suit and greasy hair in a pony tail really wouldn't do me any favours, so flowers tunic, legging and ballet pumps? 
So what would a supportive middle class mother who's child is being a little shit having difficulty coping with the school day wear?