What does a teenage girl wear to a wedding?

smokahontas
I have never been to a wedding and I need help on what to wear! I don't know any rules on what to wear and what NOT to wear at a church wedding. Please help, I want to wear a dress but I do not know really where to go to buy a good dress for a non expensive price! Any rules and stores that you suggest me to know about that you would definitely recommend a girl like me to go to?
What does a teenage girl wear to a wedding?
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