GIRLS!PROM HELP!!!!!! :)?

ok my prom is not this year its next year i was thinking if the end of year 11,my prom dress is modern so is makeup and when i have prom in year 13 (6th form) i do vintage (1960s) style ,makeup , hair and i was thinking of shortish dress ... what do you think ?or should i do the vintage style end of year 11?whats your opinions...thankyou xxx