What to wear to casual high school valentine's day dance?

Going to dance next week but dont know what to wear. Is a dress too formal for this kind of dance? or:Going to dance next week but don't know what to

Going to dance next week but don't know what to wear. Is a dress too formal for this kind of dance?

or:Going to dance next week but don't know what to wear. Is a dress too formal for this kind of dance?

or:A simple dress and flats. A nice pair of black slacks with a red or pink top and flats or short black boots.A nice pair of jeans, red or white top and red tennis shoes.A red skirt, white blouse and a cute denim jacket.

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