Hey, I've got a P220 - I had an inside the waist band rig, but in order to rock one, YOU better not have one...or a big one....if you know what I mean! As my waistline grew, the IWB holster grew less comfortable. I don't consider myself fat, so it doesn't take much!
I just switched to a paddle holster - functionality is MUCH nicer!
Just my 2 cents!