plack·et /ˈplækət/
開口,口袋
Plack·et n.
1. A petticoat, esp. an under petticoat; hence, a cant term for a woman. [Obs.]
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.
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placket
n : a piece of cloth sewn under an opening