Help me to select a dress!!!!?

Well ,yesterday i asked a question regaring what to wear in my farewell party.I received alot of answers saying sari bt unfortunately in our family girls aqre not allowed to wear a sari b4 marriage and I am only 15 yrs now studying in cl X(10) and after 17 days I will be leaving my school>please suggest me what to wear in my last farewell party a.remember that I cant wear sari or thae western clothes like jeans.i would really be very grateful ant thnx to all of u in advance!!!!!!!!!!Waiting desperately for ur answers,CHINKY!!!!