knife pleat; one-way pleat; accordion pleats
A type of pleat where all folds face the same direction, commonly used in skirts and uniforms. The term is a loanword from English.
See also: 車ひだ (くるまひだ)
This skirt has knife pleats, so it's easy to move in.
Variant with interpunct; less common but seen in some contexts.
Loanword from English 'knife pleat(s)'.