I don't do stitch for the time beign. I would need a sewing machine. The heaviest belt I currently do is 11-13oz saddle skirting from HermannOak (about 4.8mm thick).
Thanks for the quick reply. I am not in a hurry so when you get that sewing machine let me know! I like the stitched look. My current belt is a bit too big and looking kinda sad. https://m.primal.net/HWYp.jpg