How do I dress elegantly, yet appropriately for school?

I need advice on how to dress elegantly, yet still casual for school. I have trouble doing this because it is hard to change clothes for gym when I am wearing a skirt and tights and things of that nature. I want to look polished, but I don't want to look like I might be going to a ball after school. Help is... show more I need advice on how to dress elegantly, yet still casual for school. I have trouble doing this because it is hard to change clothes for gym when I am wearing a skirt and tights and things of that nature. I want to look polished, but I don't want to look like I might be going to a ball after school. Help is extremely appreciated. Oh, and I'm fourteen so please make your suggestions age-appropriate please. Thank you.
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