Extension link for coupling an unbuttoned button with a buttonhole

Extension links function like a rein that connects an undone button to a buttonhole. Extension links allow garments and items with buttons to be worn and used with the buttons unbuttoned, creating a looser fit and more room than would be the case if the button was fastened through the buttonhole in the traditional manner. This is accomplished by receiving and holding the button to one end of the link, then tethering it to a buttonhole over a span that is the length of the extension link. The extension link, in a simple embodiment, is a fixed length of any suitable material that is able to hold a button from either end, as in having elastic or fixed loop ends. An end loop of the extension link is slipped over a button, the link is passed through a buttonhole or holes, then doubled back and connected to the same or different button using its other identical looped end, with variations on this configuration. This effectively but loosely captures the buttonhole(s) to the button(s), maintaining alignment and proximity, expanding the fit, and in some cases allowing material to be folded back on itself for interesting variations in function, style and color.