Also for reference, here is that same buckle next to an $8 tatical belt I got from Etsy
View attachment 78325
The waist belt is designed to keep you attached to the saddle, not to take direct weight in a fall so like I said, I wouldn’t be concerned. To the original post, I also wouldn’t modify the stitch count either. There are so many variables when sewing into that thick milspec webbing they use. Thread size and type, needle size, needle shape, stitches per inch… you aren’t sure of any of those so going back over the stitches for fun could damage the original threads, could weaken your webbing as mentioned above AND are you even sure you have a machine capable of stitching even thread tension through these materials? The XC uses a thick nylon, not a thin seat belt for the main chassis, I can tell you first hand it requires a real machine to put T138 thread through webbing that thick and also have good thread tension across the bottom. Why chance weakening your perfectly good saddle for fun? Instead go onto strapworks and order you some webbing, go to rocky woods and get some mesh, then practice sewing those materials as a DIY build like many of us who started. Obviously use it at ground level. It’ll give you a great appreciation for how well made that Cruzr is and how much one costs