An old sweat told me that during the war, on arrival at Cape Town they had to go ashore wearing KD. The trousers were multi purpose, inasmuch one could convert them from 'longs' to 'shorts' by a series of folds, then securing them by buttons around one's thighs! The folded space between the buttons was used to carry one's personal items.
The RMAF wore jungle green, in the '60's, which looked very smart but for some reason we changed to kd which was of rather poor quality.