What to wear on my first "date"?

Hi, I'm Jennifer and I'm 13. I have been invited to go to my friend murray's house to watch the 2 twilight films because (personal joke). Our whole English table is invited with two other people. Murray, brad (my crush), Kieran, mhari (my best friend) and Victoria. I'm really excited as this is the first time I have really had an activity with brad outside of school. I want to impress him without looking too slutty or trying too hard. Mhari is wearing shorts and black tights with a top and a cute cardi, if that helps. And how should I do my make-up and hair (my hair is just below my shoulders)? And how do I give him the hint that I really do like him? And what to wear?