Buttons

In clothing and fashion design, a button is a small disc, typically round, object usually attached to an article of clothing in order to secure an opening, or for ornamentation. Functional buttons work by slipping the button through a fabric or thread loop, or by sliding the button through a reinforced slit called a buttonhole. Buttons may be manufactured from an extremely wide range of materials, including natural materials such as antler, bone, horn, ivory, shell, vegetable ivory, and wood; or synthetics such as celluloid, glass, metal, bakelite and plastic.

Shank buttons have a small ring or a bar with a hole called the shank protruding from the back of the button, through which thread is sewn to attach the button. Covered buttons are fabric-covered forms with a separate back piece that secures the fabric over the knob. Flat or sew-through buttons have two or four holes punched through the button through which the thread is sewn to attach the button. Flat buttons may be attached by sewing machine rather than by hand, and may be used with heavy fabrics by working a thread shank to extend the height of the button above the fabric.

The size of the button depends on its use. Shirt buttons are generally small, and spaced close together, whereas coat buttons are larger and spaced further apart. Buttons are commonly measured in lignes (also called lines and abbreviated L), with 40 lignes equal to 1 inch. For example, some standard sizes of buttons are 16 lignes (10.16 mm, standard button of men's shirts) and 32 lignes (20.32 mm, typical button on suit jackets).

Functional buttons (as opposed to decorative buttons) are normally paired with a buttonhole. Alternately, a decorative loop of cloth or rope may replace the buttonhole. Buttonholes may be either made by hand sewing or automated by a sewing machine. Buttonholes often have a bar at either end. The bar is a perpendicular stitch that reinforces the ends of a buttonhole.