[header] How to dress for a high school dance (girls ) [title] Go for a formal gown. [step] If you are attending a formal dance like a winter formal or prom, you should go for a formal outfit. This means a formal dress that is floor length or no shorter than three inches above your knee, with a modest neckline. 
You may go for a strapless dress or a dress with a halter top as long as it fits your upper area properly. [substeps] If your dress has slits, the slit should be no higher than three inches above your knee.