Nap A design feature of fabric that requires all parts of the sewn item to be cut in the same direction. This may either be necessary because 1) the fabric has a pile that has a definite difference between up and down such as corduroy or velvet or 2) a printed directional design.
Narrow goods Fabric woven on narrow looms with a maximum width of 27.
Nonwoven fabric This is fabric that is bonded together into a web rather than knitted or woven such as Ultrasuede.
Notches Small cuts (slits or wedges) made in the edges of garment pieces to show how they should be aligned; this helps to ensure construction is done correctly. Commercial home-sewing patterns use dark triangles or diamonds for match points.
Notions Required materials beyond the fabric and pattern necessary to producing a garment such as elastic, zippers, interfacing, buttons, thread, etc.
Nylon Nylon was the first synthetic fiber that was manufactured. It is wrinkle-resistant and easy to wash while being stain-resistant.
Oilcloth Fabric that is made to be waterproof by treating it with linseed oil varnish.
Opaque When something is opaque, such as fabric, you cannot see through it.
Organdy A lightweight, transparent cotton cloth with a stiff finish.
Overlock A stitch that casts over the seam edge to finish the seam and prevent the fabric from raveling. There are specialized sewing machines called sergers that primarily do this stitch.
Oxidation Air exposure which can alter dye colors and weaken some fibers.
Gingher G-8 8-Inch Knife-Edge Dressmaker's Shears
I have had a pair of these shears for over ten years and I love them. They are a nice weight in the hand and cut very well.