Meet your party-season secret weapon: Nova Octo, a luxury-dress rental service specializing in runway and one-of-a-kind couture designs. The best part? The company donates a portion of each fee to one of its charity partners, including the Elephant Crisis Fund and Girl Rising.
From left: Erdem dress, rent for $350 ($3,365 retail value). Prada dress, rent for $300 ($1,300 retail value); novaocto.com.