For male characters, this Lower Body Equipment raises Defense by 10, HP by 20, and Boost by 30. It can be unlocked in exchange for 1,950 Gold.
As for female characters, it raises Special and HP by 20, and Attack by 15. It can either be unlocked by earning 15 Honors/Achievements, or buying it for 2,700 Gold.
This Lower Body Equipment is unlocked at the start of the game.