I know what you mean about IWB holsters. While I like to wear my weapon in a IWB, it's not always practical. I actually like my Fobus paddle holster. it still conceals nicely, and disappears when I wear a blazer (i like to keep it buttoned up most of the time).
I once had an upside down shoulder holster that held my Mod. 60 just fine. I never had it come out either. Bianchi may still make one. Frank Ps I think El Paso Saddlery www.epsaddlery.com makes one they call the tortilla that rides close to the body & should be unobtrucive under a coat. Frank