Guess you gotta first define "fit." Yeah, you can put it in a pocket, but the more important question is whether it conceal well enough to not be conspicuous? Or to get you by in an NPE?
Generally, in my experience, jeans will accommodate a 1 7/8" j-frame, muzzle-down in a pocket holster. Some cargo/casual pants will do this, too, without risk of the pocket puffing open and exposing the butt of the gun. Most dress trousers and the more current, stylish lower-rise trousers are prone to the pocket material hanging strangely with the weight of a gatt in a pocket, and leaving the butt of the gun visible at certain angles, despite being fully within the confines of the pocket. I'd imagine that a 3" j-frame would be about 1" worse than a 2" one in this regard.