This is a three-part OVA Battle Skipper (1995), which Takashi Watanabe directed before going on to Slayers. When the members of the Etiquette Club at St. Ignacio's School for Girls literally go down the tubes, they acquire the skimpy outfits they wear to pilot the Battle Skippers (BSs), the state-of-the-art military mecha. The Etiquette Club members fight to eliminate evil from the world and this includes the bizarre schemes of Sayaka, the nasty, super-rich president of the rival Debutante Club, and her flunky, Todo.