What should she wear on the 1st day?

My little sis needs me for fashion help: shes starting 6th grade and she has no idea what she wants to wear we can go out and buy anything under $20 per item plz help she is really popular tell us what she shound wear on the 1st day that's cool!
Update: She is not starting school 3/4 of the year through she is freaking out becuz she got into this school that not many people get into its really hard and she wants a basic outline of what to wear so she won'r freak during summer becuz she wants to chill during summer.
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