Hi, i have my first interview with the army, like my preliminary one and i'm wondering, what shoudl I wear!?!?

I don't want to go for full suit, with jacket and tie, because I'm 15, and it's not one of my 3 selection interviews, but it is something that's going to count. I'm thinking black trousers, black shoes, a nice belt and fitted white shirt. Let me know what you think. :)