pleat

US /pliːt/
UK /pliːt/
"pleat" picture
1.

a double fold in a garment or other item made of cloth, held by stitching along one side and unstitched on the other, leaving the fabric free to move

:
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The skirt had several neat pleats.
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She adjusted the pleats on her dress.
:
foldcreasetuckgatherruffle
1.

to fold (a garment or cloth) into pleats

:
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She carefully pleated the fabric for the curtains.
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The tailor will pleat the back of the jacket.
:
foldcreasetuckgather