It all depends on how you'll be carrying (OWB vs IWB). If you plan on carrying IWB, you will need more length to go around the holster and gun in pants. I even found I need to buy my pants a waist size larger than normal. If you have your gun and holster already and plan on carrying IWB, best bet is to measure your length with the rig on. I normally wear size 34 to 36 pants, my Beltman belts are size 39. If you plan on wearing OWB, you won't need that extra length. Hope this helps.