The best pieces of service issue kit were the Egyptian cotton towels.
Most of the issue kit from my enlistment was replaced quickly, once I had moved to 'big boys' air force and I never did get to wear the white waistcoat that I was required to buy with my No: 5.
I was conned into buying some KD in UK before going to the steamy Far East. On turning up at HQFEAF with 'moonie' knees, wool long socks and 'canvas' KD, the senior officer to whom I reported, called one of his female officers into the office. "Ah Monica" he says "could you take Pilot Officer Old Duffer down to Changi village and sort him out with some wearable uniform". Thereafter until the day I left regular service, I bought all my kit 'made to measure' from tailors in Singapore or Hong Kong. Unfortunately, when as a reservist and needing new kit, the Far East option was no longer available and the current uniform is pretty dire!
Old Duffer