trench coat belt replacement

I got a trench coat from Coach Outlet. It was (imo) the most classic option for the money minus a couple of features. Longest coat in this range, all the hardware is covered in leather, gun flap, fabric is decent, etc. Only gripes are that the belt is a little short so I can’t just knot it, and the cuff straps are leather (or faux leather). I think it looks nice, but does anyone know where I can source a longer belt, preferably with D rings on the belt, as well as cuff straps in a similar enough leather? Thanks ahead!