Inside waistband holsters are positioned on your side below your beltline, inward toward your strong side. Some of these types of holsters are designed with loops for you to slide your belt through. At the same time, some are made with two parts that sit between your underwear and the outside of your pants. They attach to the belt loops of your pants and sit flat against your body with a clip or the backing holding it in place.
The right side for an inside waistband holster is either on the left or right, depending on which hand you shoot with. Each IWB holster is different, so be sure to read through any included instructions before use.