There is a type of dog ID tag which slips on the collar, so it doesn't clank. You can then buy any collar of the proper width that you like; and the matching leash.

If you click on this link, you can see the purple one, top right, is the type I mean.
http://www.tagxpress.com/

This is the pet ID tag place I have used for years. They hire handicapped people as employees. I have all my tags from them. They make the slip on type it is also purple, just a little harder to see in their photo, which is why I gave you the other link to see the type of tag.

http://www.petidtags.org/