Most of our leather holsters are made by Tim Thurner at TTGunLeather.com. He does have the casting for the regular 3913, so if that's what you have then that's an excellent choice. While we find his prices very competitive for the quality, they are not as economical as some of the other alternatives, but then custom & semi-custom leather shouldn't be cheap.
This is a TTGunleather Stronghold
'Convertible' for the Dan Wesson CCO. It's in normal IWB mode in the photo. Take off the leather loops and it becomes a pancake. Replace the leather loops with Kydex loops from TopGunSupply and it's a tuckable IWB. The 1911 is my traveling CCW, so I prefer having a single holster that adapts to many configurations.
Below is a standard Stronghold IWB for the Kahr PM40. The PM40 is my daily CCW, so I prefer a specialized holster that suits the needs of the day without compromise. Some days that's IWB and other days it's OWB.
And the pancake Stronghold pancake for most days when OWB meets my needs.
Unfortunately, he doesn't have the casting for the 3913LS/3913NL, so we had to look elsewhere for holsters for them. We found them at Kramer, but it's still on order.
We also have a TTGunleather '
Pegasus' holster for the little Sig P238. This style is a favorite of Mas Ayoob, but I find it less comfortable than the style with twin belt loops.
I have several Crossbreed IWB holsters; primarily the Minituck for the smaller pistols. I've had to return two of them because the Kydex portion was a very poor fit and the gun wasn't retained at all. OTOH, I've found that some guns, like my Kahr PM40 get jammed in a Crossbreed holster because they taper the sight track instead of making the sight track full length. The following photos illustrate the problems with the Crossbreed.
The Crossbreed holster works OK for the Kahr CM9 because it does not have a laser and the gun can move towards the rear during the draw as the front sight runs out of sight track. However, when the gun is equipped with the laser, as the PM40 to the left is, then the laser prevents the gun from moving aft in the holster during the draw until the laser clears the holster. The HUGE problem is that the front sight runs out of track first and jams in the holster. I found it jams so hard that I had to drop my pants to get the gun dislodged.

Terrible design!
I have two other issues with the Crossbreed:
- The thin leather used makes for a form fitting holster, which may be comfortable, but the sweat guard quickly deforms and lays across the rear of the slide. Yes, I could cut it off, but that could lead to other problems and why should I have to futz with their design to make it work?
- The edges of the Kydex belt loops are quite sharp. Not sharp enough to cut yourself, but sharp enough to be annoying when your arm runs into them. This was an easy fix, but again IMHO it shouldn't have been that way in the first place.
An alternative to the Crossbreed that I like is the MTAC by Comp-Tac. They are built of two layers of leather so they are stiffer, plus the Kydex shells are removable so it's easy and inexpensive to convert the holster to a different gun. Note, that I have trimmed off the bottom of the MTACs for the smaller guns - like the Crossbreed, they use a one-size-fits-all mentality.