Don't mess with Uncle Mikes, they aren't too good. That type of holster is a bit out of our specialty, but contact these guys - they build super nice holsters: http://www.diamonddcustomleather.com/Chest_Holsters.php
There is another outfit that makes really good hunting rigs, but I will have to dig up their contact info.
Just be careful about the retention on some of the chest/shoulder-type hunting rigs - I see a lot of custom makers that put the retention strap behind the trigger guard and leave the trigger exposed - a strong branch caught in the trigger can fire it then, or something catching the hammer can cock it easily and a light bump to the trigger fires it. Retention strap should go around the back of the hammer, or else the hammer should be covered. Trigger should always be covered on a DA revolver.