Well, what I might first recommend before you look into purchasing another is to measure your waistline to see what number you come up with. If you can find one UNDER that size, get it. But it's possible they may not make one that small. If that's the case, you will probably need to mod it or make your own.
Can you take a few pics of the buckle ends where the white rope comes together at the buckle?
Curious to see what modifications could be done in order to get it to fit...