collar button

It took him some time to assemble these infrequently used accessories, and he was dismayed to find no collar-button.

Or that other mean man I heard of, who was so economical that he used a wart on the back of his neck for a collar-button.

Now he raised it and placed it against his chest, just above his collar-button.

A collar-button was the corner-stone of his toilet—the object on which everything else depended.