The Maid Outfit is a black dress with white trim around the edges. The sleeves are white with lace-trimmed black cuffs around the upper arm, and a white apron is wrapped around the waist. It also includes a set of black boots with silver buckles. Anna's version of the outfit has a heart-shaped piece of black cloth over her chest.
In addition to providing decent boosts to Defence and Magic Defence, the Maid Outfit raises the wearer's HP, Attack, and resistances to Earth and Wind. Between turns, it may cast Cleanse on a random player, healing all of their status ailments and stat debuffs.
Epic Battle Fantasy 4
Found on the Battle Mountain, specifically on the first factory screen, in a chest accessible after you beat the eight-wave foe rush with foes from the Waste Disposal Plant. The Hammer is required to get this far.