I was going to suggest Puppia or Buddy Belt, LOL, but since those are out...
How about the harness actually called the Choke-Free Harness? It's leather, it's similar in style to the Buddy Belt, but no belt.
You can get new ones on ebay or amazon for cheaper.
I have both the BB and the ChokeFree and like them for different reasons. ChokeFree seems less bulky, for sure, IMO. It's like a thinner leather.
http://www.chokefree.com/id4.html
Puppia is my go-to though. I find it to be the easiest to put on, seems the most comfortable, easy to wash, so don't worry about it getting wet or dirty.