......The SP101 is a SUPER concealable revolver, and for those who said it is not a hideout gun.....what the heck do you carry?
Good belt, good holster, no problem. I am only 5'9" and 160 lbs......
If you can hide your 101 under a T-shirt, great....but most of us will likely need to do a bit more dressing to cover one in an OWB holster.
Just to answer your question;
These days I carry a full-sized BHP. Before that, it was a 1911A1....both IWB with a pronounced "FBI tilt"...no holster. That has worked real well for me for a number of years....but...both are slimmer in cross-section than a 101.
Good belt?...yes indeed.
Good holster?...I've about tried 'em all. "No holster" works the best for me to "hide" the arms I prefer to carry.
I am 6'2" and 210 lbs.....and to be fair, almost never go about in just a T-shirt.
Bear in mind though, that we are talking about two different types of guns here.
Semi-autos are flat in cross-section and tend to "stay put" IWB. Revolvers are thicker in the middle due to the cylinder, so the problem there is "where to position the cylinder?"...if ya leave it above the belt, the gun shifts around, and under some circumstances, a short-barreled model might even fall out; if ya place it bellow the belt, the dern gun just might end-up slipping down inside your pants-leg.....I've had that happen.....so yeah, your gonna need a holster to carry one of those...which adds to it's cross-section...which is already greater than the cross-section of a semi-auto of equal (or greater) power....so what I'm still saying is the same thing I said before; namely, the SP-101 aint a hide out gun.....leastways, not in the sense as a J-frame Smith or a little .380 pocket-rocket.....both of which are perty-easy for anyone to hide, even in a holster.
Not arguing, just sayin' that we aint all the same.