Sentence:  Mind you, clothes were clothes in those days. [...]  Frills, ruffles, flounces, lace, complicated seams and <WSD>gores</WSD>: not only did they sweep the ground and have to be held up in one hand elegantly as you walked along, but they had little capes or coats or feather boas. 
Meaning of the word marked with <WSD> tags:  A triangular or rhomboid piece of fabric, especially one forming part of a three-dimensional surface such as a sail, skirt, hot-air balloon, etc.(Wp)