As you can see in my twitter below, I saw these pics (on tumblr of all places) and thought it was super hot.
It wouldn’t really be that difficult to do. Most hardware stores carry this sort of chain (or similar), so just measure off and get a padlock. I may have to try it!
Unfortunately I couldn’t wear it 24/7 (which would be even hotter) due to my work and travels. But I still like the idea! Would you wear one? If so, send me a pic!