Luna lovegood question. My niece is going to the midnight party as her she asked this plz tell me what you thi

She don't have a drak blue sweeter so she is going to wear a white dress shirt unbottoned with a tied blue shirt under it and a blue jen skrit thats up to about her knees she has the earring but not the nackless she wanted to get a BIG bead neckless...dose that sound ok as in the hole outfit???? I like harry potter but am not THAT into it so you harry potter ppl please tell me would this work??