I'm looking for a shoulder holster

[rbs]

I want one like Joe Friday wore on Dragnet for my .38.

 

[BoondockSaint]

I think they were Lewis Police Special holsters

 

[ClydeFrog]

IMFDb.org, Dragnet, custom leather shops...

For a custom leather revolver rig, you may need to speak to a top shop like Ken Null or El Paso Saddlery.
Note; any custom designs won't be cheap so if this is a project you really want it will cost a pile of $.
For details about Jack Webb & Dragnet see; www.IMFDb.org .
CF