I'm not sure whether I'm now going OT or not, as I was never in Colditz [
] and haven't seen the recent re-broadcast.
However, KD ... Singapore, 1967 ... and on arrival one was given a week off to acclimatise and purchase uniform, so to the best of my recollection the FEAF Joining Instructions made it clear we didn't need to bring stuff from UK. Accordingly, to Tengah Village where the necessary was ordered, made and delivered within the space of a couple of days. Curiously [or not] there seemed to be different shades of material depending on where you sourced your kit ... and that included the Station Tailor and Supply Sqn! Matters were further complicated by those who had kitted in Borneo, Hong Kong or elsewhere in FEAF ... and they all faded differently! I can still recall one mate in ATC who's HK-sourced KD faded to almost white, whilst others wore kit that was almost brown.
I don't recall any attempt at enforcing standardisation.