treo: If you're mostly wearing jeans...just get a nylon rigger belt (also called a "BDU belt").
They are light, soft, can be cinched down to any desired waist measurement or holster snugness. Normal width is 1.75" , but they can be found in 1.25". A multitude of colors are available (black, navy blue, tan , grey, OD, sand, brown, sage, etc.) and they only cost a few dollars.
The ones worn by everyone in the Army (with BDUs or ACUs) cost about $3.75. Commercial versions range from $4-$8. I've routinely used one to carry OWB 1911s, Browning Hi-Powers, CZ75s, and Beretta 92s.
If you want to go with stiffer and heavier, you can sink money into beefed up versions (so-called "Instructor" or "Wilderness Survival" belts). These have additional features (internal stiffeners, doubled & sewn nylon layers, Velcro, metal V/D-ring connectors for use while rappeling or with safety lanyards).
The basic belt works fine and is both light and comfortable.
Here are several vendors /variations (you can also search for "BDU Belt"). There are hundreds. You should also be able to find these belts in any Army-Navy Surplus Store and some gunshops or sports stores.
http://www.lapolicegear.com/lapogebdube.html
http://www.vtarmynavy.com/bdu-belts.htm
http://www.georgia-outfitters.com/page49.shtml
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Hope this helps...