What to wear on a job interview?

I'm 15, tommarrow I have my first job interview at a grocery store. I am not sure what to wear for it, since its not like a fancy job should I not have to dress fancy. What would you say im to wear? I was thinking just wearing my jean pant, a cardigan or...

a long sleeve shirt with sandles and pearl necklace(is it too much)? I REALLY want this job.
Thanx

You should always be over-dressed! No jeans or sandles. You want to impress your employer and you want to look as professional as possible. Good luck!

so if I cant wear sandles, then what am I to wear? my sneakers??? the only other pants I have are a corderoy and a black pair with a hole on the ankle.

well, work with what you have or can get your hands on. you should wear shoes. not sneakers, but shoes. flats would be fine, don't need heels. and wear a nice shirt. something with buttons would be nice. and a nice pair of pants and you should be ok. hair done. don't have all peircings in, if you have many. just the ears are cool. and uh.. yeah lol

So how did it go? If you dressed smartly and respectably maybe they be looking at you as someone who they could depend on and promote.