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I first began by creating a box and extruding it at the end to create the fold for the buckle, I also edited the vertecies at the other end to make it more rounded.
I then created the strap by the buckle that holds the belt when it's fastened by creaating a cylinder, but without the centre so it had space for the belt to pass through. I modelled it into a more rectangular shape too.
I created three boxes and sculpted haped them into the buckle, connect by a cylinder passing through the belt.