What should you wear when you go out with a boy?

I think every girl is asking herself the same and importesten question-"what should I wear when I go out with a boy?".It depends of your private style, of the style of this boy and were you go, I don´t know, when for exemple you go with him in the cinema, I think you shouldn't wear somethink speciel , but when you go out with him in the opéra for exemple, it isn´t the best idea to go with a shabby jeans, and a tube top, with plunging neckles. The best dress code for the opéra is a  simple black dress - black is a simple but also a very elegant colour, what don´t mean that you are  too chic or overdressed.
so let´s make a plan, when you out in a opéra:
- don´t wear any sort of jeans
-don´t wear a tube top-plunging neekles-or even a simple t-shirt
-don´t wear something were you exatly know that isn´t confortable for you (to small,to short...)
-and don´t even think about to wear all this staff!
*now what you should wear:
-dress or skirt
-somethink were you are absolutly sure that it is elegant, confortable, and that it is just you.