Sentence:  Suppose you advertise a “five-inch glass <WSD>nappy</WSD>.” It doesn′t tell a reader anything — a woman especially. She can′t tell how big five inches are anyway ; but just say, “large imitation cut glass fruit saucers at thirty cents a dozen,” and get your packers ready. 
Meaning of the word marked with <WSD> tags:  A shallow, flat-bottomed earthenware or glass bowl with sloping sides.