Yes th edouble stitching would take time but a larger amount of a hide could be used adn the waste from other equipment cutting could provide other pieces, utilizing more to the hide, so not a cost saver but a material saver. The Brits possibly didnt find it as effective due to the labour intensive process of the new cutting etc, while the Australians may have foudn it better to be able to utilize a smaller amount of pelts, after all they never went to Kangaroo hide as far as I know. Local markets and supply makes for a diffference.