Sounds like you've got it all worked out, then! When i buy leather ones, i get 13"-15". This makes it so that the buckle fits at the middle hole , and there's not too much extra left over.

i like the leather, but it is slightly warm on my neck. In icey's avatar, the metal looks like it sits on the collarbone and doesn't lay against the skin...this looks more comfy to me. i think you've made a really good choice, Tojo.