This is for this holster since there is no option to to comment; I wonder why.
These are pretty skinny to handle the trigger guard of the types of guns they should accommodate. It will work with some effort and I ordered a second to see if it was a one off thing. It handles a S&W 637 barely and a Taurus 650 is debatable. A typical size 36 should work for both but much better for the S&W.
The top two are the old in the pocket size 36 with the airweight 38 and notice the depth of insertion. The new size 36 holster will not accommodate the trigger guard of this very small revolver. Much like with kids shoes the proof in the fit is by pressing the toes to see and with the new holster the barrel is an inch short of touching. IMHO, this is not a size 36 holster based on the one I received, but maybe the second one I ordered will be better.