2.5" belts will be no problem, 2.75" would be OK. But a 3" belt would be a tight squeeze.

The pistol belt I used is 2" wide. I'm thinking of making a 2.5" ranger style belt with a 1.5" or 1.75" buckle. I saw a nice 1.5" Masonic buckle recently for $12.95.

BTW Bill, would you be a traveling man?