Find the word definition

Longman Dictionary of Contemporary English
pencil skirt
noun
EXAMPLES FROM CORPUS
▪ Belted suit and long slim line pencil skirt with split, in raspberry, teal and black, £69.99.
Wiktionary
pencil skirt

n. A slim skirt (clothing) with a straight and narrow cut, usually approximately knee-length.

Wikipedia
Pencil skirt

A pencil skirt is a slim-fitting skirt with a straight, narrow cut. Generally the hem falls to, or is just below, the knee and is tailored for a close fit. It is named for its shape: long and slim like a pencil.