The document discusses and defines various types of pleats that have been used in historical costumes, including accordion pleats, knife pleats, box pleats, cartridge pleats, fluted pleats, fortuny pleats, honeycomb pleats, kick pleats, organ pleats, plisse pleats, rolled pleats, watteau pleats, kinguissie pleats, spiraling pleats, and sunray pleats. For each pleat type, the document provides a definition and sometimes examples of how and when it has been used in historical garments.