noun / verb
pleat
PLEET/pliːt/
A fold pressed or sewn into fabric, or the act of making such folds.
Each pressed pleat forms a neat fold in the fabric strip.

Etymology
The root’s folding action became the name of its result: a crease or flattened gather. A pleat preserves that concrete image of cloth doubled back upon itself in a narrow strip.
In context
this is all doubled over fabric and so it creates this humongous like pleat that never that never releases.
More examples
- The pleats give the skirt room to move.
- Pleat the fabric before sewing it to the waistband.
- He pleated the curtain along its top edge.
Forms
pleat · pleats · pleated · pleating