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Brown belts work especially well for Steampunk goggles. The older the belt is, the better; consider picking one up from the back of your closet, the thrift shop, or a garage sale. The belt must be thin enough to fit through the strap slots on your goggles. You can also cut your own straps out of leather, but you will need to add your own buckle and punch your own holes. The two outer segments need to be long enough so that you can strap them together while wearing the goggles. Set aside the middle segment and keep the outer two. Slide the end of your first strap down through the left side slot on the goggles. Pull the end through by about 1 inch (2.54 centimeters). You can do this by sewing, using fabric glue, or by hammering in brass, gold, or bronze studs. Sewing and gluing will work best on straps made from thin leather, while hammering in studs will work better on straps made from leather belts.  If you choose to sew the straps, be sure to use a thick, waxed thread, and a leather needle. If you choose to glue the straps, you will need to secure them with clips until the glue dries. If you choose to hammer in nail studs, consider getting ones made specifically for leather work; the ones made for fabric may not be tough enough. Add the nose strap if needed. Cut a thin piece of leather or find an old watch band; you can also cut a thin scrap from canvas fabric. Slide both ends of the strap through the slots on the front of the goggles. Secure them using the same method as you did for the back strap; sewing or gluing will work the best, however.
Choose a thin, leather belt to make the straps. Cut the leather belt apart into three segments. Fit the new straps onto the goggles. Secure the ends to the main strap.