Im just starting in the world of CC. I've got a G26, crossbreed IWB holster and a crossbreed spare mag holster IWB. I should be receiving my comp-Tac kydex reinforced belt by the end of the week. Is there a general rule of thumb when buying pants designed to fit all of this inside my waist band? One size bigger? Two sizes? Is it a trial thing? Just gotta try different sizes of different brands? Any input is appreciated.