ruching means: A gathered overlay made up of strips of fabric that have been pleated, fluted or gathered to form a ripple effect is called rusting. From the 16th-century ruff, the frill, or pleat, of the fabric is often lace, or chiffon, or muslin. (in Fashion Dictionary)

What else does ruching mean?

Today’s fashion description uses the term “ruching” to describe clothing that has large, full areas and is gathered together to create a ripple effect. Ruching was an ancient technique that involved pledging fabric strips and sewing the pleats together. The bands could be sewn to different parts of the garment. (in Fashion Dictionary)

Rubbed material, or part of clothing. (in Merlin Dictionary)