Lulus is a popular destination for dresses, and its prom selection doesn't disappoint. There are all different necklines (apron, boat neck, v-neck, scoop, strapless, surplice, cowl), all different ...
It’s just not the occasion for your new white dress, as much as online stores love dumping them in the 'wedding guest’ section. I’d avoid anything too tight/short, and ditch super formal ...