Check out the Wilderness Instructor belts. The 5-stitch version should offer sufficient support. I have the 1.5" Frequent Flyer version and it works well. I've used it to carry K-frames with an IWB holster. Bonus: The FF version has no metal components so you can wear it through airport security and/or metal detectors.
There are other makers, but I'm not familiar with them.
I still prefer my Beltman belt for regular carry. I'm not sure how a belt prints, though. A good, thick, double-layer leather belt is still the best option, in my opinion. I think it gives the best support for carrying a gun, helping to keep it close to your body, which helps minimize any printing issues the gun may have. Belt thickness wouldn't have any effect on printing.
But the Instructor-type belts are good if you prefer nylon.