pencil skirt
US /ˈpen.səl ˌskɜːrt/
UK /ˈpen.səl ˌskɜːrt/

1.
a narrow, straight skirt, usually knee-length, designed to fit closely to the body
:
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She wore a black pencil skirt and a white blouse to the meeting.
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A classic pencil skirt is a versatile addition to any wardrobe.