Well, you seem really happy about this date so you should look your best. No girl can go wrong with a casual dress. A nice sweater dress with some nice warm tights to go with it since it will be cool. If you can't get a sweater dress, you can wear a cute cotton long sleeve shirt with a nice pair of jeans. You should also accesorize. A nice necklace or bracelet, nothing too fancy. And a girl can never go wrong with eye liner. It will make your eyes pop and he'll notice. A little bit of lip gloss too. Try to wear your hair down or in a nice sexy/messy ponytail. Make sure to smell extra nice as well. Good luck!