They at least have the two inches of material to let the waist out if needed. I haven't followed the history of the Rivet, but one of the other canvas pants that came has no extra material to work with, so maybe it's an even older version.
Another very nice black Vass boot. F last 42 / 9 US (9.5 per seller?). Austerity, no hooks, goyser, trees. Can still see JR on the soles. $495 obo