A frog (sometimes referred to as a Chinese frog) is an ornamentalbraiding for fastening the front of a garment that consists of a button and a loop through which it passes.
The usual purpose of frogs is to provide a closure for a garment while decorating it at the same time. These frogs are usually used on garments that appear oriental in design. Tops with a mandarin collar often use frogs at the shoulder and down the front to keep the two sections of the front closed. Frogs are usually meant to be a design detail that "stands out".
Many sewers make their own because supplies are inexpensive and the results are customizable. Using larger or smaller size cording or fabric tubes will result in larger and smaller frogs. Also, self-fabric can be used to create frogs that are the same color as the garment, though frogs are usually chosen to be a contrasting color to that of the garment.
Frogs are made by looping and interlocking the cording or fabric tube into the desired design, then securing the places where the cords touch by hand-sewing. The frog is then stitched onto a garment, usually by hand. When a fabric tube is used, the fabric is cut on bias. This allows the fabric tube to remain smooth and flex easily when bent into curves.