Or rouching. A sewing technique, that creates small pleats, ruching happens when fabric is gathered or folded back on itself informally.
1. Fabric that is gathered or pleated between two fixed edges, as much or as little as needed for effect. It is used in lampshades and to make ruched edgings for cushions, curtains and pelmets.
2. An unlined sheer blind can be made to ruche up so that it virtually gathers up into a small space; the cords and ring systems at the back are positioned in such a way that they create soft narrow pleats