A good belt does more than just keep your pants up. It is the finishing touch on a truly great outfit, and a means by which one may exhibit that extra dash of stylish panache. And Bonobos belts, as it just so happens, have plenty of panache to spare.
Your belt size is two sizes larger than your pant size. If your pant size is 30, your belt size is 32; if your pant size is 34, your belt size is 36. Order your belt by your belt size, not your pant size. Go up two sizes.