I like the Mernickle holsters.
They have several styles for 3" N Frames, strong side or cross-draw.
403 Forbidden
I just got another of their cross-draws for my 396 and am pleased with it.
They have a unique design which has a flat back piece making them very comfortable
but they stick out a little bit more than a true pancake.
They will make a holster for darn near any gun ever made with the features you want/need.
No affiliation, just a happy customer.
There are many good brands.
The above posts mention some of them.
Here's a couple pictures.
That's a Galco 1.75" belt.
Their holsters are very good too.
I am looking at a shoulder rig from them right now.
I wasn't going to mention this because they are rare and out print for 35 years but my
absolute favorite 3" N Frame holster
is the legendary "BLW" that came with the 3" 624 around 1985.
These DO show up occasionally here in the forum.
If you see one of these, buy it.