Casing: Fabric sleeve which encloses elastic or a drawstring. Casings are made in several different ways and are used mostly at the waist of a garment, although they can also be used in a pants cuff or sleeve cuff.
Clip: Seam allowances are clipped so that the seams will curve inward or outward smoothly. Inward curves are snipped with a slight cut; outward curves should be notched. Be careful not to make the notches too large. Trimming the seam allowance with pinking shears is an easy, neat looking alternative to clipping and it also grades the seam allowance at the same time. Serging your seams is another way to eliminate the need for clipping.
Cording: Rope or string used for piping and as a drawstring. Cording is frequently covered with bias strips of a fabric.
Crotch: Seam which joins the two legs of pants; the body area this seam covers.
Covered Button: Button covered with fabric. A nice way to make your garment and buttons match.
Cutting Board: A cardboard or fiberboard surface to lay out and cut your fabric on. Most commercial cutting boards have measurement marks and fold up for storage. For rotary cutting, special vinyl cutting mats are available.
Cutting line: The dark, outer line of a commercial pattern that shows you where to cut.