Easier than it might seem at first glance - - -
- - - Again, stipulating a good belt and well designed holster, and the willingness to wear a long enough outer garment.
The pants belt must be strongly enough constructed and stiff enough to properly support the holster/revolver combination. The belt slots or tunnel on holster and the width of belt need to match.
The cant of the holster on the belt must suit one's own body type.
Large, flared-bottom target style stocks will print no matter what. slimmer stocks with rounded bottoms conceal far better.
Surprisingly, a three- or four-inch revolver of medium size often is easier to conceal than a shorter barreled piece. This si because the longer barrel touches the hip bone and tends to press the butt back into the body. This allows use of a holster that carried the gun higher, placing the putt area back into the hollow of the waist, above the hip bone.
The true forte of the snub revolvers is for pocket, ankle or shoulder holster carry, not for outside waistband holster carry.
I have holster/belt/stock combos which allow me to conceal my S&W .45 Mountain Gun, a Model 19 (or any other K-frame) and my Colt .357 (Python-size,) all in four-inch. Their weight is the real problem for me--I have very narrow hips, and packing a big revolver almost requires suspenders, for me.
All the above concerns outside waistband carry. It is a bit more difficult to properly conceal with a shoulder holster, without specially tailored clothing and a custom fitted holster. Inside waistband carry is somewhat more readily available, but not very comfortable, for me, at least.
All best,
Johnny