Tucking

To Tuck: to make one or more folds in the material,

 to gather up and fold, thrust, or turn in so as to secure or confine.

  

The act of tucking: A flattened pleat or fold, especially a very narrow one stitched in place.

Tucking: Viktor Smedinge, Cental Saint Martins, Ready-To-Wear Fall 2011;