·noun A woman's pocket.
II. Placket ·noun A petticoat, ·esp. an under petticoat; hence, a cant term for a woman.
III. Placket ·noun The opening or slit left in a petticoat or skirt for convenience in putting it on;
— called also placket hole.
a pocket-hole. York. From the Scots. ...
A glossary of provincial and local words used in England by Francis Grose