What to wear at a high school bonfire?

I was invited to a bonfire by one of my friends friends who is in some of my classes (he invited our mutual friends mostly)(we are sophomores in high school (10th grade)). I have never been to a party type bonfire, so I am kinda nervous. I wanna have I be so one of the guys gets attracted to me and wants to maybe kiss or cuddle with me? (I have never kissed anyone). But I don't want to act or look like a slut because im not. It's going to be about 60 degrees tonight so I can't really wear a skirt or shorts.

Thanks
What to wear at a high school bonfire?
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