I carry my Ruger LCR as a pocket piece. (( When I want a belt gun, my 605 rides iln a Hulme))

Here's a problem: I'm looking for a nylon holster for the Ruger so IF I choose to belt carry, I can. (Like when I'm out hiking around, or maybe wearing tailored pants.) But the LCR has a fat grip section and doesn't seem to fit most nylon IWB rigs I've tried. BTW, for pocket carry, I use a Blackhawk Number 4, which is actually marked for "compact 9mm autos". The Number 3, for 2" 5-shots is a tad tight for the LCR, but DOES fit my 605.

Unfortunately, since nylon holsters are cheap, nobody includes a sizing chart in their web site.

Any ideas on size for something like an Uncle Mike's or Blackhawk IWB?