The revolvers are iffy, but El Paso Saddlery makes an M3 or M7 holster for different pistols.

http://www.epsaddlery.com/pc-154-14-1942-tanker-holster-3-to-5-barrels.aspx

If anything you have will fit in to a 1911 holster, USGI M-7 holsters are available for $40'ish.


Also, Eagle Industries makes an adjustable chest holster out of nylon that is similar to the M3/M7 rig and Blackhawk makes a knock off of the Eagle.

http://www.eagleindustries.com/product.php?productid=424&cat=54&page=1

http://www.blackhawk.com/product/Universal-Spec-Ops-Pistol-HarnessHolster,1429,34.htm