/plak"it/ , n.
1. the opening or slit at the top of a skirt, or in a dress or blouse, that facilitates putting it on and taking it off.
2. a pocket, esp. one in a woman's skirt.
3. Archaic.
a. a petticoat.
b. a woman.
[ 1595-1605; var. of placard breastplate plaquier to plate placken to patch; cf. PLAQUE ]