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Can wear with any belt, but the bulge in your centerline will be much less obvious if you offset a buckle to the right.
The sidecar clips are far enough apart to split a buckle, but it make a pretty decent hump on your beltline.
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Definitely helps to conceal better with the buckle offset to the right or left, as there is no large bulge in the middle of your beltline. I have worn my sidecar with all kinds of different belts, and have found that a belt that isn't overly stiff is more comfortable for appendix carry. In my experience, if a belt is super stiff it tends to dig into my side/hip area and isn't comfortable for long periods of time, makes my back stiff sometimes too when carried too long.
Daily carry I either wear an older 5.11 nylon belt with the plastic buckle, or the Stormrider gear belt. I like the Stormrider a lot, it adjusts really easily and the velro is holding strong for me even a year later. They also have a good warranty so when the time comes I will have it re-velcro'd and keep on wearing it.