I originally got this idea from the TV show "Shark Tank".
This is my geeky low tech version that uses 2 earth magnets and any piece of metal to attach your glasses to your shirt.

Print - Cut off support material and clean holes for magnets
Magnets were purchased from:
http://apexmagnets.com/index.php?main_page=product_info&cPath=4&products_id=327