Hostess job interview - coming straight from school

I'm coming straight from school (high school) to a hostess job interview. Is it unprofessional if I bring my school bag? The only alternative is to leave it in my locker overnight which I'd rather not do if I can help it. I'll also be in my school uniform but I assume I should change out of that before hand.

As for my outfit I'm planning on wearing black jeans and a white blouse, but I'm not sure what sort of shoes to wear. I can't wear heels or anything as there is a risk of snow in my area.

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