What should a 14 year old wear to Ruth's Chris for dinner?

I am going to Ruth's Chris with my parents for dinner on Sunday for fathers day and I have no idea what to wear.....any suggestions??|||something nice and elegant. its a nice place and a typical jeans and tshirt look wont work. id wear a nice dress or something.|||something not too revealing.. thats for sure|||male or female? If it is dinner, one wants to wear what would be considered casual work attire. Hard to say for a young teen though.