Nice idea... several of the 'custom' holster makers will have on hand or will make a belt too. However, they will be high dollar examples. Another idea is multi pocket pants. Dockers used to make a nice pair of such pants and some can still be found on e-bay. The same style of pants is now made by 5.11 clothing. Here's the web site:
http://www.511tactical.com/browse/Home/Law-Enforcement/Pants/Casual-Pants/Covert-Khaki-Pants/D/30100/P/1:100:10000:10100:10104/I/74269

They also make lots of other designs and jeans too. The quality is good and they can often be found in 'law enforcement' catalogues and websites at a discount. This may be a more practical approach then relying on just a belt - maybe a combination of the two?

Paul -