Buy it:
http://www.artofadornment.ca/catalog/product_info.php/products_id/579
Gothic Pirate Skull Cuff Button Covers
Limited edition of 4. Sold in pairs. Ideal for the look of cufflinks on regular button-cuff shirts and blouses (also great for covering mandarin collar buttons). Traditionally Gothic pewter skull-and-crossbones ornaments with a dark antiqued silver matte finish. Made from a series of limited run metal buttons, mounted on shiny silvertone nickel-plated hinged button covers. Simply pry open the hinge, slip the notched half over a button, and clip shut. Will cover almost any button up to about 15mm (5/8 inch) diameter.
Dimensions: 11/16" (18mm) diameter