pleat
US /pliːt/
UK /pliːt/

1.
pli
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
:
•
The skirt had several neat pleats.
La jupe avait plusieurs plis soignés.
•
She adjusted the pleats on her dress.
Elle a ajusté les plis de sa robe.