Forward planning and efficiency
At the end of the war my dad was sent form Italy to RAF Chivenor still wearing his desert issue uniform, it was October and quite nippy. The MOD/RAF finally managed to demob him and his mates in January at the same time as they delivered their demob suits and cold weather uniforms. Fortunately WWII RAF shorts came down to the knees and the socks came up to just below the knee but it did mean blue knee caps.
I hope the MOD have improved their planning and procurement capabilities a little since then.