The N-frame S&W revolvers are rather large, and most are quite heavy (scandium frames the exception). The cylinders are about 1.75" in diameter, making a significant "lump" to deal with for reasonable concealment. Loaded weight of the steel frame guns will usually run from 2.5 to 3 pounds.
A few observations:
1. To support the weight of the holstered revolver you must have a sturdy belt. The belt is the foundation on which the carry rig functions, so any attempts at shortcuts on the belt will probably lead to disappointments with the holster's performance.
2. A good pancake-style holster offers several advantages, including:
A. The weight is spread over a wider area of the belt and supported both fore-and-aft of the holstered handgun.
B. The outer shell of the pancake holsters form a convex shape, disguising the bulk of the revolver (especially cylinder diameter) and allowing the cover garment to glide over the holstered handgun with less chance of snagging or "printing".
3. Weight distribution of the N-frames, especially the shorter barreled models (4" and less) is usually balanced on a line through the trigger guard and toward the rear of the cylinder. Attempts to raise the ride height of the revolver that may place that balance point above the belt line can be expected to allow the revolver to tip out away from the body, compromising both concealability and security.
4. Overall profile of the N-frame revolvers might be thought of as a wedge-shape, with that large cylinder at the wider end of the wedge. This can create some challenges for retention in the holster, so a mechanical means for retention (such as the thumb-break retention) may be desirable for law enforcement application or anyone expecting to be involved in strenuous physical activities.
5. Within the various N-frame models there are 3 cylinder lengths, with both fluted and unfluted models made, and multiple barrel profiles (tapered, bull, ribbed & unribbed, no underlug, short underlug, and full underlug). This creates quite a variety, and for best fit and retention qualities your holster maker should be informed of the exact model and features of your revolver. Simply ordering a holster for "N-frame 3", or "N-frame 5", etc, can produce disappointments.
I regularly use 5 different N-frame revolvers in the shop for patterning and forming holsters to achieve the best fit (taking into account the various cylinders and barrel profiles). Even at that I can't match completely everything Smith & Wesson has chosen to produce.
Best regards.