Job Interview at Saladworks?

I'm 14. I know this is not the most important part of getting the job, but I want to make myself look presentable. I already prepared and rehearsed possible interviewed questions. But what should I wear? Skinny jeans, heels, and what top? I don't know if I'm supposed to dress formal or casual? Or do you have a totally different idea? I think I'll also wear simple stud diamond earrings, straight hair, and just mascara and eyeliner - no extravagant makeup. Please help?