When I ride in a free state I pocket carry my model 37 in galico pocket holster.
I ride in jeans 95% of the time and the tighter pockets hold the gun very securely. I wouldn't attempt this in cargo shorts however, I've never lost anything from my pockets but I could see it happening with baggy pants.
The bigggest problem for me is I have to store the gun UNLOADED in locked case in a saddle bag with the ammo in its own case in the opposite side saddle bag to comply with FOPA until I get out of NJ. In a car I simply pull over once over the state line retrive my locked case and ammo get back in the car and load/holster up.
On a bike thats not so easy, and finding a place to do it where everyone and their brother can't see you is near impossible