Well I'm not sure what your style is overall.... and I think I understood that you're going to a show at a theater. If you're going to wear a skirt, don't wear a really short one and your top maybe not show a lot of cleavage. A little bit is ok in my opinion because it's sexy but more in a classy way. Same goes for a dress. If you feel more comfortable in pants, just wear a pair of black dressy pants and a nice top. Since I don't know what Donny and Marie is ... I hope all this is at least a bit helpful. You will probably be more dressed up than him but that's ok. Make sure what you're wearing is comfortable too!! You don't want to be on edge or have a million things go through your mind when you should be enjoying each other's company.

Is he driving you? If he is, then you don't really need a jacket even though it gets cool at night.

What you wear can't show whether or not you want a relationship but it CAN show whether or not you want a one night stand. Just because someone dresses nice and classy does not mean they necessarily want a relationship, you know... that's something you don't necessarily need to bring up on the first date. Also since he goes to school far, I don't think you have much to worry about. Just go on your date and enjoy yourself.

Lastly, I'm jealous of your LA weather so enjoy it!!