What to wear to In-N-Out interview?

I’m a high school senior and am going to an open interview at In-N-Out soon. I dropped off my resume in person and spoke to the manager a few days ago. What attire is best for my interview? I have a white button down with some vertical stripes but it’s made of this soft (not stiff) fabric, is that okay? Also I’m assuming jeans are not acceptable, so should I go with slacks or khakis? I just don’t want to appear too casual or too overdressed.

Edit: forgot to mention that I'm a girl lol... not sure how much of a difference it makes but I'd like the most relevant advice

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