I carry on my job every day. There is a work clothing supplier here who has an Amish connection who makes harness leather belts in Brown and Black with great hardware on them. Nice rounded buckles and stiff leather to hold your weapon up. They run $22.00 a piece!! The same belt from Galco or another holster maker would run $100. PM me if you want the shop name.
I use a Columbia Leather Belt. Its very thick and very strong. Had it for several months now and no problems holding up the weight of a gun and holster.
Check out Dillon's catalog www.bluepress.com, they have a selection of belts from the wilderness instructor to leather by Mitch Rosen that will blend in and not look like "tactical" attire.
I have had great luck with comp tac kydex reinforced belts. Very comfortable and will not role up after prolonged use . I have two and love birth of them.