After two days of looking with my mom, I finally found my prom dress. It's yellow and the skirt part is big and puffy, and I love it. I love it so much that I bought it, even though the zipper doesn't do up. My mom is calling someone she knows to alter the back so that it ties rather than zips, because it feels fine otherwise.
I found the dress right before we had to go home and pick up Erik from volenteering, so I didn't have time to get shoes or a necklace or anything like that. I'm hoping that someone still needs to do that so I can leave my mom alone now. She hates shopping. :)