The only quality maker I know of that made them and they had two models that were dandys, was Bianchi. I used to sell them in the '70s at my dad's leather shop. They no longer make the models for a small frame long barrel DA.
But here they are:
The 1st and my choice, Model 5BHL has a sight protector, open trigger guard, suede lined, and quick thumb release snap closure. They still list it for the Kit Gun, but 4" only. I'd call and ask if they'd make a 6" for you. If not, I'd buy the 6" K frame size and wet form it to your HFT and see how it works. If too loose, I'd have a saddlemaker or shoe repair run a stitch down the seam about 1/4" inside of the existing stitch line to tighten 'er up. They could also reset a snap in the retaining strap if needed.
Model 5BHL Thumbsnap Holster Bianchi Leather Holsters
The 2nd, Model 111 covers the trigger guard, suede lined, and quick thumb release snap closure. If you prefer this, I'd again get one for a K frame and etc.
Model 111 Cyclone™ Hip Holster Bianchi Leather Holsters