IWB type carry is not as critical as far as a belt goes. If the belt is flimsy, OWB carry will result in a gun that sags away from the body as others have said.
After having carried for a brief period of time with a work belt, I bought a good quality leather "gun belt." This was much better, as I was carrying OWB, and the gun quit sagging away from my side. The belt was a little too stiff, and not as comfortable as I would have liked. Also, seemed that one hole was too loose, the next one in, too tight. Bought a Wilderness 5 stitch, which has no adjustment holes--just pull the belt thru its adjustment rings til if feels right. Wear it whether I carry or not, never looked back on the leather stuff.
NS