What to wear help please!!!?

Ok so I'm going to a block party on Friday and I don't know what to wear and I want to look really cool and cute at the same time I'm 11 so not anthing too sexy but maybe allitle bit and I am going shopping soon too so i can go to the mall or something and my budget is like 50$ and I basically only need a shirt maybe a hat or something but so ya and don't say anything mean and maybe some necklaces and rings and bracelets And eyeshadow