What should I wear to my job interview at Gap?

I finally got a call back from gap lol, now I’m just stuck on what to wear!! For my last job, it was in the winter so it was easy to dress nice but now that it’s summer I have no idea of what to wear! The website says jeans are ok, and to wear the gap/old navy brand as much as possible. I have a bunch of clothes from old navy, including a really nice pair of jeans & a grey t shirt dress. I was gonna wear the dress because it’s simple but can be dressed up with a nice pair of sandals/flats and some statement jewelry but I’m not sure. Help lol!!