The larger the model, the sooner the eye slides to the seat. 1:24 fabric seatbelts for aircraft models pass that test comfortably, because laser-cut printed microfabric behaves like a real strap. Sets cover the Spitfire Mk.IX, Hellcat, Mosquito, Typhoon and Bf 109 K-4, with universal Luftwaffe and Sutton harness alongside.
At giant scale a strap several millimetres wide cannot be faked with a painted stripe. Fabric also carries a buckle in scale that you can examine with the naked eye. Step-by-step assembly is described in fabric seatbelts for aircraft. The fascia deserves the same care, so look at 1:24 instrument panels, and find the next project in 1:24 aircraft model kits.