We found one of these at a dollar store and I think it's pretty good, kind of soft, a nice fit and not overly difficult to get on and off. The only thing is I'm working on changing out the cord lock cube for something else so it won't bother him if he rolls on his back.
www.sporn.com - Mesh Non-Pull Harness
We started with a lovely soft easy velcro one from ebay, but as of last week it doesn't hold him anymore if he decides there's a dog he wants to see.
Me I'm looking for a soft collar that doesn't have big buckles, in case he has to wear one to hang his tags on or something.