Source : Webster's Revised Unabridged Dictionary (1913)

Waistcoateer \Waist`coat*eer"\, n.
   One wearing a waistcoat; esp., a woman wearing one uncovered,
   or thought fit for such a habit; hence, a loose woman;
   strumpet. [Obs.]

         Do you think you are here, sir, Amongst your
         waistcoateers, your base wenches?        --Beau. & Fl.