A simple and super-cheap way to carry any odd gun IWB is the 'string' holster. Two versions exist. The simplest is a string with two loops that fit around your belt; the space between the loops just wide enough for the gun to fit. Slip the gun into that space and tuck it inside the trouser band with the string behind the gun. This holds it from slipping down further. Best for autos.
Even better for any gun but especially revolvers: a string with ONE belt loop, and on the other end, a short length of non-metallic rod (I've used hollow upholstery stiffeners, an inch or so long and about 1/4" dia., anything resembling a short length of drinking straw or even a dowel will do.) Length between the belt loop and rod adjusts to fit the distance between the muzzle of the gun and the point you want it to appear above the belt line. Shove the string around or through a hole in the rod and knot it...slip the rod into the muzzle of the gun and shove the whole business into your waistband. Holds well, impedes the draw not at all.
If you sweat and carry blued guns, this has drawbacks. And, of course, you don't see these 'expedient' carry techniques in the gun rags...no way to make money off of them.
