Ladies always used to wear pretty frocks and high heels. Skirts are probably acceptable these days.
Gentlemen need to complement the ladies – clean, tidy and reasonably smart. In the past a gentleman would have worn a lounge suit but this is probably not so common these days. Wear a tie and if it seems OTT, then take it off and shove it in a pocket. Wear shoes that you can dance in that are well polished. Have fun.
Being quizzed by chemist's assistant in Boots.