I have found that double 1.25 belts work well for whatever gun I carry, and fit my dress pants.
Mine include RafterS, but I would caution against buying from them in view of experiences of members for the last year or so. Search and you will see. I have Sparks, and Beltman 1.5" belts, but seldom wear them.
I tend to like nice belts, and do not care for anything but nice leather. Any of mine are suitable for dress or outdoors.
I have a couple of Bianchi 1.5" single layer belts that are not satisfactory for carrying a gun.
Holster makers like Sparks make great ones, but the wait may be too long for you. Here are a couple that I have noticed lately on the forums. I don't have any personal experience with them but their work looks good on the sites. It may be worth a call to them.
http://www.agcustomgunleather.com/ca...php?category=8
http://www.rgleather.freehomepage.com/catalog_2.html
Get a good double layer 1.25" belt and you will be happy, I think.
Regards,
Jerry