I'll join the crowd in advocating that a proper belt is the core of an effective carry system regardless of the other details (assuming it's a belt-mounted holster of some sort).
Some people accept this right away. Some learn by experience that it's true and wish they hadn't wasted time and money on crappy belts once they finally heed the advice and get a good belt. Some will never accept it, even though their holster moves around, flops outwards, never allows a consistant draw, and is uncomfortable to boot.
A good belt with a crap holster is almost always better than a crap belt with a good holster.
Some people accept this right away. Some learn by experience that it's true and wish they hadn't wasted time and money on crappy belts once they finally heed the advice and get a good belt. Some will never accept it, even though their holster moves around, flops outwards, never allows a consistant draw, and is uncomfortable to boot.
A good belt with a crap holster is almost always better than a crap belt with a good holster.