Definify.com
Webster 1913 Edition
Placket
1.
A petticoat, esp. an under petticoat; hence, a cant term for a woman.
[Obs.]
Beau. & Fl.
2.
The opening or slit left in a petticoat or skirt for convenience in putting it on; – called also
placket hole
. 3.
A woman’s pocket.
Webster 1828 Edition
Placket
PLACK'ET
,Noun.