2nd interview! What to wear?! He said dress business style but I don't have any business clothes.…

2nd interview! What to wear?! He said dress business style but I don't have any business clothes. It's for a manager job at a fast food place so I don't think there expecting super business- like. Do I put my hair up or down? Theyre providing the uniforms for work this is just for the interview. I know I have black slacks but I'm more worried about a t-shirt the closest thing I have is maybe a blouse. I normally just wear mom clothes lol