I like the "make it yourself idea" and may try it too. Long term I'm going to get a harness/leash combo from chattiesmom but bought a cheaper one for use until Aidan's size is known. The company that makes them also sells this matching Tag It - Pet ID Holder. (Had to get one of course...)
Cetacea Corporation - Pets :: Toys & Gifts :: Tag-It (Pet ID Tag Holder)