n. A coat with short flaps. [ 1913 Webster ]

n. One wearing a waistcoat; esp., a woman wearing one uncovered, or thought fit for such a habit; hence, a loose woman; strumpet. [ Obs. ] [ 1913 Webster ]

Do you think you are here, sir,
Amongst your waistcoateers, your base wenches? Beau. & Fl. [ 1913 Webster ]