They specialize in IWB's and they list the 686 as a model thay build for.
They show a quite a few different styles in both nylon & leather.
Pricing looks good too.
I'm a lefty too. I can appreciate your difficulties finding anything left handed.
Go to their contact page and ask them for specifics. I'm sure they can help you out.
Also you might want to look at http://www.opticsplanet.com and run a search on the 686