I'm really liking my 642 these days, and have been searching for the "perfect" holster. I've come to realize that "perfect" depends on what I'm wearing, and I like to have options for how I carry this gun. I usually carry something small, because I'm 5'8", 140 lbs, and DO NOT like to wear baggy clothing. Yeah, I'd love to conceal a GP100, but that just ain't happening. My Glock 19 is the biggest gun that I conceal, and that is in Winter only.
I alternate between pocket, IWB, and OWB carry with my 642. I have to say that my new favorite carry method is OWB in a Don Hume JIT Slide with a flannel shirt or hoodie over the gun. For a gun this small and light, it just disappears when carried that way. My belt is a Blade-Tech "Looper".
My holsters are: Don Hume JIT slide OWB, Uncle Mike's pocket holster, High Noon Mr Softy.