pogo2

Although I generally prefer a 1-1/2 inch holster myself, I believe the 1-1/4 inch holsters are generally adequate tp support a gun, especially in IWB carry. The method of support is different with IWB than OWB, and the IWB relies heavily upon the "hoop effect" of the tightened belt exerting a force directly inward toward the body on the gun and holster, trapping or pinching the gun against the body. With an OWB holster, the gun and holster are hanging on the outside of the belt, and the belt must exert an upward force and be stiff enough to resist twisting. That is where the stiffness and thickness of a 1-1/2 inch belt will be better than a similar 1-1/4 inch belt.

Of course 2 other factors would be important also - the weight of the gun and the material of the belt. Lighter weight guns and more rigid belt material would help the support situation.