Just wanted to +1 on A & G's gun belt. And a definitive yes, it makes a big difference compared to a non-gun belt regarding support and comfort!
I just received a 1.25" gun belt from A & G Custom Gun leather and highly pleased with their excellent craftsmanship. Turn around time was under 4 weeks. They also have premade Quick Ship belts that are immediately available. I just ordered a Quick Ship 1.5" belt (bull hide, light brown) for my casual attire. I highly recommend them!
Here's my 1.25" dress gun belt in bull hide (2 layers, ~.25" thick), 7 oblong holes spaced .75" apart, floral Chicago screws: