What to wear ? suggestions?

im a small petite girl whose in 8th grade getting reaady to graduate. im 75 lbs and my heidgt is 4'3, and i wanna look my best during the graduation without looking frilly and childish (im 14) theres no particular color we have to wear so i would appreaciate some suggestions and im open for opinons and advice , but please do hurry graduation is not to far away!!!