Quarter scale is where most detailing effort goes, and textile belts travel well into it. Even at 1:48 the webbing sags over the seat back of its own accord and the printed buckles hold up to close inspection, which is precisely the difference you will not get from a flat etched strip no matter how carefully it is annealed and bent. The listing is built mainly on Basic Line sets for individual aircraft, from the Yak-9 to the Fw 190; confirm the application from the aircraft named in the title.
Quarter-scale airframes that these belts suit fill the 1:48 aircraft kits listing, from early monoplanes to late-war fighters. If you are detailing the whole cockpit rather than just the seat, consider resin castings from Big Sin 1:48 sets alongside them. Every series and scale from the brand is summarised under HGW.