These belts are adjustable. The buckle can detach completely. There is a tooth-clasp for one end (to attach the buckle) and a clamping part (also toothed) for the buckle. So, the belt is adjustable from both ends.

Be aware that the tooth grip upon the belt will make it fray. I doubt the web belt will last more than a year.  The buckle will last through several web belts.