Quote Originally Posted by An t-Ileach
The problem is the leather - at 57" you're pushing the limit of the hides ('cos you have to add about another 3"-4" for the buckle turn), although you can get longer ones out of some butts. Width isn't so much of a problem, although many belts are conditioned by the available buckles.
An option would be to splice a few belt blanks together into a "Ranger-style" belt, where there are additional plaques of leather interspersed along the length, and the buckle turnover and belt tongue are not integral to the belt itself - they're stitched-on additions.

Like these: Ranger-style tool belt