PN, thanks for that interesting input. At least some of the equipment abandoned by the BEF served useful to other than the Wehrmacht. So they did have some form of uniform stores at Colditz? I thought I was being clever, too clever by far it seems!
B48N, I too managed to avoid Station Parades at RAF Changi, though quite how, being a mere F/O, I'm not sure. Those who did testified to the colour range on parade, from brown through khaki to off-white. Shorts length varied from "Empire Builders" to scarcely decent.
As others have said, Changi Village was a first point of call, with more elaborate additions available later in Hong Kong (Samtanis, Nathan Rd, Kowloon, in my case). I had already been kitted out though with the Empire Building Kit for the 242OCU Night Flying Detachment to Idris. Got shot of it ASAP, the FE tailors outperforming all UK competition, state or private enterprise!