Button Snap Eyeglass Holder + Magnetic 
The SpecSporter provides a simple and convenient way to keep your spectacles or PropEyes handy on your person. Two ways to attach to your garment - Snap to your button or affix with powerful magnets.
 
Worn on the outside of clothing
Snaps onto standard sized buttons (15 mm), or
Attach with powerful magnets
 
Warning:  Includes powerful magnets. Please consult your physician if you have a pacemaker or defibrillator.