i was no spring chicken when i went to see it with a group from work.most of them were a fair bit younger and they all dressed up VERY outrageously. i went in a long black velvet dress with a fur collar which i already had, and someone had some dayglo pink hair spray which they liberally applied to my hair. very pale make-up and deep pink lipstick completed my outfit.
whilst not the most imaginative outfit there, i feel at the very least i had made some effort and got into the spirit of it. and it didn't cost a fortune. and i didn't feel a complete idiot in the pub :o)