What is "ruching"

Usage examples of "ruching".

Her friend Miss Chadwick wore a sky-blue jaconet gown with an ermine tippet, and a white satin bonnet with blue ruching and a large blue bow tied off to one side of her heart-shaped face.

The huge puffed sleeves were fashioned with rows of midnight blue velvet ribbon and narrow silk ruching whose iridescence changed from dark to a silverish blue.

True, she was inexperienced, unaccustomed to dealing with the complexity of ruffles and ruchings, ignorant of lace-mending techniques, sometimes a little confused between morning and afternoon dress.