What should I wear to my interview?

I’m 18 and I have an interview at Steak N’ Shake (A restaurant with a 50’s theme known for steak burgers and hand-dipped milkshakes). I’ve only had 2 jobs before and I’ve only been to three interviews. None of my jobs before have been very professional though just a grocery store and a work-study job at my college, but I feel like working in a restaurant would definitely be a step-up. I’m not sure what to wear for my interview though and I really really want this job. My mom always wears a dress suit or a skirt and a blazer type look, but I don’t want to look older than I am and I want to feel comfortable at my interview.. My daily attire is usually a sun dress and a cardigan and either flats or flip-flops. I figure I could probably try to dress up my daily outfit by wearing a pair of my dark flats and one of my longer dresses and maybe just doing my hair and makeup and accessories to look a bit dressier.. But I don’t know if there’s a certain color or style I should stick to.. Like would a v-neck look trampy? And would pink make the manager unable to take me seriously? And is it okay to be bare-legged? Or should I wear tights or panty hose? My interview’s tomorrow morning and I can’t figure out what to wear.. Someone please help?!